q11/random_k2/random_1.md

Q U I E T C O M F O R T   4 5

Please read and keep all safety, security, and use instructions.

Bose Corporation hereby declares that this product is in compliance with the essential requirements and
other relevant provisions of Directive 2014/53/EU and all other applicable EU directive requirements. The
www.Bose.com/compliance
complete declaration of conformity can be found at: www.Bose.com/compliance

This product conforms to all applicable Electromagnetic Compatibility Regulations 2016 and all other
applicable UK regulations. The complete declaration of conformity can be found at:
www.Bose.com/compliance
www.Bose.com/compliance

Bose Corporation hereby declares that this product is in compliance with the essential requirements per
Radio Equipment Regulations 2017 and all other applicable UK regulations. The complete declaration of
www.Bose.com/compliance
conformity can be found at: www.Bose.com/compliance

Important Safety Instructions
Do not use this apparatus near water.

Clean only with a dry cloth.

Refer all servicing to qualified personnel. Servicing is required when the apparatus has been damaged in any way,
such as power-supply cord or plug is damaged, liquid has been spilled or objects have fallen into the  apparatus, the
apparatus has been exposed to rain or moisture, does not operate normally, or has been dropped.

WARNINGS/CAUTIONS
•  Do NOT use the headphones at a high volume for any extended period.

 – To avoid hearing damage, use your headphones at a comfortable, moderate volume level.

 – Turn the volume down on your device before placing the headphones in/on your ears, then turn the volume up

gradually until you reach a comfortable listening level.

•  Do NOT use your headphones while driving for phone calls or any other purpose.

•  Do NOT use the headphones with noise canceling mode at any time the inability to hear surrounding sounds may
present a danger to yourself or others, e.g., while riding a bicycle or walking in or near traffic, a construction site or
railroad, etc., and follow applicable laws regarding headphone use.
 – Turn the headphones off, or use the headphones with noise canceling off and adjust your volume, to ensure you

can hear surrounding sounds, including alarms and warning signals.

 – Be aware of how sounds that you rely on as reminders or warnings may vary in character when using the

 headphones, even with Aware mode.

•  Do NOT use the headphones if they emit any loud unusual noise. If this happens, turn the headphones off and

contact Bose customer service.

•  Remove headphones immediately if you experience a warming sensation or loss of audio.

•  Do NOT use mobile phone adapters to connect headphones to airplane seat jacks, as this could result in injury or

property damage due to overheating.

•  Do NOT use the headphones as aviation communication headsets.

Contains small parts which may be a choking hazard. Not suitable for children under age 3.

This product contains magnetic material. Consult your physician on whether this might affect your
implantable medical device.

•  To reduce the risk of fire or electrical shock, do NOT expose this product to rain, liquids or moisture.

•  Do NOT expose this product to dripping or splashing, and do not place objects filled with liquids, such as vases, on

or near the product.

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IMPORTANT SAFETY INSTRUCTIONS
IMPORTANT SAFETY INSTRUC TI ONS

•  Keep the product away from fire and heat sources. Do NOT place naked flame sources, such as lighted candles, on

or near the product.

•  Use this product only with an agency approved LPS power supply which meets local regulatory requirements

(e.g., UL, CSA, VDE, CCC).

•  Do NOT make unauthorized alterations to this product.

•  If the battery leaks, do not allow the liquid to come in contact with the skin or eyes. If contact is made, seek

medical advice.

•  Do not expose products containing batteries to excessive heat (e.g. from storage in direct sunlight, fire or the like).

•  Do NOT wear while charging.

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REGULATORY AND L EGAL  INFORMATI ON

NOTE: This equipment has been tested and found to comply with the limits for a Class B digital device, pursuant to
Part 15 of the FCC Rules. These limits are designed to provide reasonable protection against harmful interference in a
residential installation. This equipment generates, uses, and can radiate radio frequency energy and, if not installed
and used in accordance with the instructions, may cause harmful interference to radio communications. However,
there is no guarantee that interference will not occur in a particular installation. If this equipment does cause harmful
interference to radio or television reception, which can be determined by turning the equipment off and on, the user
is encouraged to try to correct the interference by one or more of the following measures:

•  Reorient or relocate the receiving antenna.

•  Increase the separation between the equipment and receiver.

•  Connect the equipment into an outlet on a circuit different from that to which the receiver is connected.

•  Consult the dealer or an experienced radio/TV technician for help.

Changes or modifications not expressly approved by Bose Corporation could void the user’s authority to operate this
equipment.

This device complies with part 15 of the FCC Rules and with ISED Canada  license-exempt RSS standard(s).  Operation
is subject to the following two conditions: (1) This device may not cause harmful interference, and (2) this device must
accept any interference received, including interference that may cause undesired operation.

This device complies with FCC and ISED Canada radiation exposure limits set forth for general population. This
 transmitter must not be co-located or operating in conjunction with any other antenna or transmitter.

Meets IMDA Requirements.

FCC ID: A94437310

IC: 3232A-437310

CAN ICES-3(B)/NMB-3(B)

For Europe:

Frequency band of operation 2400 to 2483.5 MHz.

Maximum transmit power less than 20 dBm EIRP.

This symbol means the product must not be discarded as household waste, and should be delivered to an
appropriate collection facility for recycling. Proper disposal and recycling helps protect natural resources,
human health and the environment. For more information on disposal and recycling of this product, contact
your local municipality, disposal service, or the shop where you bought this product.

Management Regulation for Low-power Radio-frequency Devices
Article XII
According to “Management Regulation for Low-power Radio-frequency Devices” without permission granted by
the NCC, any company, enterprise, or user is not allowed to change frequency, enhance transmitting power or alter
original characteristic as well as performance to an approved low power radio-frequency devices.

Article XIV
The low power radio-frequency devices shall not influence aircraft security and interfere legal communications; If
found, the user shall cease operating immediately until no interference is achieved. The said legal communications
means radio communications operated in compliance with the Telecommunications Act.

The low power radio-frequency devices must be susceptible with the interference from legal communications or ISM
radio wave radiated devices.

DON’T attempt to remove the rechargeable lithium-ion battery from this product. Contact your local Bose retailer or
other qualified professional for removal.

Removal of the rechargeable lithium-ion battery in this product should be conducted only by a qualified  professional.
Please contact your local Bose retailer or see products.bose.com/static/compliance/index.html
further information.

products.bose.com/static/compliance/index.html for

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REGULATORY AND L EGAL  INFORMATI ON

Please dispose of used batteries properly, following local regulations. Do not incinerate.

Names and Contents of Toxic or Hazardous Substances or Elements

Toxic or Hazardous Substances and Elements

Part Name

PCBs

Metal Parts

Plastic Parts

Speaker

Cables

Lead
(Pb)

Mercury
(Hg)

Cadmium
(Cd)

Hexavalent
(CR(VI))

X

X

O

X

X

O

O

O

O

O

O

O

O

O

O

O

O

O

O

O

Polybrominated
Biphenyl
(PBB)
O

Polybrominated
diphenylether
(PBDE)
O

O

O

O

O

O

O

O

O

This table is prepared in accordance with the provisions of SJ/T 11364.
O:  Indicates that this toxic or hazardous substance contained in all of the  homogeneous materials for this

part is below the limit requirement of GB/T 26572.

X:  Indicates that this toxic or hazardous substance contained in at least one of the homogeneous materials

used for this part is above the limit requirement of GB/T 26572.

Date of Manufacture: The eighth digit in the serial number indicates the year of manufacture; “1” is 2011 or 2021.

China Importer: Bose Electronics (Shanghai) Company Limited, Part C, Plant 9, No. 353 North  Riying Road, China
(Shanghai) Pilot Free Trade Zone

EU Importer: Bose Products B.V., Gorslaan 60, 1441 RG Purmerend, The Netherlands

Taiwan Importer: Bose Taiwan Branch, 9F-A1, No. 10, Section 3, Minsheng East Road, Taipei City 104, Taiwan Phone
Number: +886-2-2514 7676

Mexico Importer: Bose de México, S. de R.L. de C.V., Paseo de las Palmas 405-204, Lomas de Chapultepec, 11000
México, D.F. Phone Number: +5255 (5202) 3545

UK Importer: Bose Limited, Bose House, Quayside Chatham Maritime, Chatham, Kent, ME4 4QZ, United Kingdom
Input Rating: 5V p 0.5A
Charging Temperature Range: 32° F to 113° F (0° C to 45° C)

Discharging Temperature Range: -4° F to 140° F (-20° C to 60° C)

Model 437310. The CMIIT ID is located inside the earcup under the scrim.

Please complete and retain for your records
The serial and model numbers are located inside the earcup under the scrim.

Serial number:  __________________________________

Model number:  __________________________________

Please keep your receipt with your owner’s guide. Now is a good time to register your Bose product. You can easily
global.Bose.com/register
do this by going to global.Bose.com/register

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REGULATORY AND L EGAL  INFORMATI ON

Security Information

  This product is capable of receiving security updates from Bose automatically when connected to the Bose
Music app. In order to receive security updates via the mobile application, you must complete the product
setup process in the Bose Music app. If you do not complete the setup process, you will be responsible
for installing security updates that Bose makes available via btu.Bose.com
btu.Bose.com

Apple, the Apple logo, iPad, iPhone, and iPod are trademarks of Apple Inc.,  registered in the U.S. and other countries.
App Store is a service mark of Apple Inc. The  trademark “iPhone” is used in Japan with a license from Aiphone K.K.

Use of the Made for Apple badge means that an accessory has been designed to connect specifically to the Apple
 product(s) identified in the badge, and has been certified by the developer to meet Apple performance standards.
Apple is not  responsible for the operation of this device or its compliance with safety and regulatory standards.

The Bluetooth® word mark and logos are registered trademarks owned by  Bluetooth SIG, Inc. and any use of such
marks by Bose Corporation is under license.

Google Play is a trademark of Google LLC.

USB Type-C® and USB-C® are registered trademarks of USB Implementers Forum.

Bose, Bose Home Speaker, Bose Music, the Bose Music logo, Bose Smart Soundbar, Bose Smart Speaker,
Bose Soundbar, QuietComfort, and SimpleSync are trademarks of Bose Corporation.

Bose Corporation Headquarters: 1-877-230-5639

©2021 Bose Corporation. No part of this work may be reproduced, modified,  distributed, or  otherwise used without
prior written permission.

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REGULATORY INFORMATION
LICENSE DISCLOSURES

The following license disclosures apply to certain third-party software packages used as components in the product.

Package: FreeRTOS

Copyright © Amazon Web Services, Inc. or its affiliates. All rights reserved.

The FreeRTOS package is subject to the license terms reprinted below:

MIT License

Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated
 documentation files (the “Software”), to deal in the Software without restriction, including without limitation the
rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit
persons to whom the Software is furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all copies or substantial portions of
the Software.

THE SOFTWARE IS PROVIDED “AS IS”, WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING
BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
 NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT
OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

Package: Nanopb

Copyright © 2011 Petteri Aimonen <jpa at nanopb.mail.kapsi.fi>.

The Nanopb package is subject to the license terms reprinted below:

Zlib License

© 2011 Petteri Aimonen <jpa at nanopb.mail.kapsi.fi>

This software is provided ‘as-is’, without any express or implied warranty. In no event will the authors be held liable
for any damages arising from the use of this software.

Permission is granted to anyone to use this software for any purpose, including commercial applications, and to alter
it and redistribute it freely, subject to the following restrictions:

1.

 The origin of this software must not be misrepresented; you must not claim that you wrote the original software.
If you use this software in a product, an acknowledgment in the product documentation would be appreciated
but is not required.

2.

 Altered source versions must be plainly marked as such, and must not be misrepresented as being the
original software.

3.  This notice may not be removed or altered from any source distribution.

Package: Mbed TLS 2.16.1

© ARM Limited. All rights reserved.

The Mbed TLS package is subject to the license terms reprinted below:

Apache License

Version 2.0, January 2004

http://www.apache.org/licenses/
http://www.apache.org/licenses/

TERMS AND CONDITIONS FOR USE, REPRODUCTION, AND DISTRIBUTION

1.  Definitions.

“License” shall mean the terms and conditions for use, reproduction, and distribution as defined by Sections 1
through 9 of this document.

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LICENSE DISCLOSURES

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“You” (or “Your”) shall mean an individual or Legal Entity exercising permissions granted by this License.

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source code, documentation source, and configuration files.

“Object” form shall mean any form resulting from mechanical transformation or translation of a Source form,
including but not limited to compiled object code, generated documentation, and conversions to other
media types.

“Work” shall mean the work of authorship, whether in Source or Object form, made available under the License,
as indicated by a copyright notice that is included in or attached to the work (an example is provided in the
Appendix below).

“Derivative Works” shall mean any work, whether in Source or Object form, that is based on (or derived from)
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LICENSE DISCLOSURES

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©2021 Bose Corporation

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the License.

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See the License for the specific language governing permissions and limitations under the License.

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WHAT’S IN THE BOX

Contents .............................................................................................................................  13

BOSE MUSIC APP

Download the Bose Music app ..................................................................................  14

Add the headphones to an existing account .......................................................  14

HEADPHONE CONTROLS

Power on ............................................................................................................................  16

Standby timer ..........................................................................................................  16

Power off ............................................................................................................................  17

Headphone functions ....................................................................................................  18

Media playback and volume ...............................................................................  18

Phone calls ................................................................................................................  19

Action button ........................................................................................................... 20

NOISE CANCELLATION

Noise cancelling modes................................................................................................  21

Change the noise cancelling mode ..........................................................................  21

VOICE CONTROL

Access voice control ......................................................................................................  22

BLUETOOTH® CONNECTIONS

Connect using the Bluetooth menu on your  mobile device .......................... 23

Disconnect a mobile device ........................................................................................ 25

Reconnect a mobile device ......................................................................................... 25

Connect another mobile device ................................................................................ 25

Identify connected mobile devices .......................................................................... 25

Switch between two connected mobile  devices ................................................ 25

Reconnect a previously connected device ........................................................... 26

Clear the headphone device list................................................................................ 26

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CONTENTS
WIRED CONNECTIONS

Connect the audio cable ..............................................................................................  27

BATTERY

Charge the headphones ............................................................................................... 28

Charging time........................................................................................................... 28

Hear the battery level ........................................................................................... 28

HEADPHONE STATUS

Bluetooth status  ............................................................................................................. 29

Battery status  .................................................................................................................. 29

Charging status  .............................................................................................................. 30

Update and error status  .............................................................................................. 30

CONNECT BOSE PRODUCTS

Connect a Bose Smart Speaker or Soundbar ......................................................  31

Benefits .......................................................................................................................  31

Compatible products ............................................................................................  31

Connect using the Bose Music app .................................................................  31

Reconnect to a Bose Smart Speaker or Soundbar ............................................ 32

CARE AND MAINTENANCE

Store the headphones ................................................................................................... 33

Clean the headphones .................................................................................................. 34

Replacement parts and accessories ........................................................................ 34

Limited warranty ............................................................................................................. 34

Serial number location .................................................................................................. 35

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CONTENTS
TROUBLESHOOTING

Try these solutions first ................................................................................................ 36

Other solutions ................................................................................................................ 36

Restore the headphones to factory settings ....................................................... 39

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CONTENTS
WHAT ’S IN THE BOX

CONTENTS

Confirm that the following parts are included:

Bose QuietComfort 45  headphones

Carry case

USB Type-C® cable

3.5 mm to 2.5 mm audio cable

NOTE: If any part of your product is damaged, do not use it. Contact your authorized

Bose dealer or Bose customer service.

worldwide.Bose.com/Support/QC45
Visit: worldwide.Bose.com/Support/QC45

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BOSE MUSIC APP

The Bose Music app lets you set up and control the headphones from any mobile
device, such as a smartphone or tablet.

Using the app, you can manage Bluetooth connections, manage headphone settings,
choose your voice prompt language, and access new features through updates.

NOTE: If you’ve already created a Bose Music account for another Bose product, add
the headphones to your existing account (see the bottom of page 14).

DOWNLOAD THE BOSE MUSIC APP

1.  On your mobile device, download the Bose Music app.

B O S E   M U S I C

2.  Follow the app instructions.

ADD THE HEADPHONES TO AN EXISTING ACCOUNT

To add your Bose QuietComfort 45 headphones, open the Bose Music app and add
your headphones.

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HEADPHONE CONTROLS

Action button

Multi-function button

Power/Bluetooth
switch

Volume up

Volume down

2.5 mm audio cable port

USB-C® port

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HEADPHONE CONTROLS

POWER ON

On the right earcup, slide the Power/Bluetooth switch to the right.

A voice prompt announces the battery level, and the status light glows according to
the current charge level (see page 29).

Standby timer
The standby timer conserves the battery when the headphones are not being used.

To set up and customize the standby timer, use the Bose Music app.

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HEADPHONE CONTROLS

POWER OFF

Slide the Power/Bluetooth switch to the left.

NOTE: When the headphones are powered off, noise cancellation is disabled.

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HEADPHONE CONTROLS

HEADPHONE FUNCTIONS

The headphone controls are located on the back of the right earcup.

Media playback and volume

Volume up

Multi-function button
Volume down

FUNCTION

Play/Pause

WHAT TO DO

Press the Multi-function button.

Skip forward

Double-press the Multi-function button.

Skip backward

Triple-press the Multi-function button.

Volume up

Volume down

NOTES:

Press H.

Press z.

•  To quickly increase the volume, press and hold H.
•  To quickly decrease the volume, press and hold z.

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HEADPHONE CONTROLS

Phone calls
The Multi-function button is located on the back of the right earcup. The microphone
is located near the front of the right earcup.

The Action button is located on the back of the left earcup.

Action button

Multi-function button

Microphone

FUNCTION

WHAT TO DO

Answer/End a call

Press the Multi-function button.

Decline an incoming call

Press and hold the Multi-function button for 1 second.

Answer a second incoming
call and put the  current call
on hold

While on a call and a second incoming call is ringing,
press the Multi-function button.

Decline a second incoming call
and stay on current call

While on a call and a second incoming call is ringing,
press and hold the Multi-function button for 1  second.

Switch between two calls

While two calls are active, double-press the
Multi-function button.

Create a conference call

While two calls are active, press and hold the
Multi-function button for 3  seconds.

Mute/Unmute a call

While on a call, double-press the Action button.

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HEADPHONE CONTROLS

Action button
The Action button allows you to quickly and easily switch between noise
cancelling modes.

The Action button is located on the back of the left earcup.

Action button

To switch between Quiet Mode and Aware Mode, press the Action button.

For information about noise cancelling modes, see page 21.

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NOISE CANCELLATION

Noise cancelling reduces unwanted noise, providing a clearer and more lifelike audio
performance. You can choose between two noise cancelling modes: Quiet and Aware.

Quiet Mode allows you to block out distractions using the highest level of
noise cancellation.

Aware Mode provides full transparency and allows you to hear your surroundings
while enjoying your audio.

Choose your noise noise cancelling mode based on your listening  preferences
and environment.

NOISE CANCELLING MODES

MODE

Quiet

Aware

DESCRIPTION

World-class noise cancellation with Bose-optimized audio.

Hear your surroundings while enjoying your audio.

NOTE: When powered on, the headphones default to the last mode you used.

CHANGE THE NOISE CANCELLING MODE

To change the noise cancelling mode, press the Action button.

A voice prompt announces the selected noise cancelling mode.

TIP: You can also change the noise cancelling mode using the Bose Music app.

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VOICE CONTROL

ACCESS VOICE CONTROL

You can use the headphones to access voice control on your mobile device. To access
voice control, press and hold the Multi-function button for 1 second.

The Multi-function button is located on the back of the right earcup.

NOTE: You can’t access voice control while on a call.

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BLUETOOTH  CONNECTIONS

CONNECT USING THE BLUETOOTH MENU ON YOUR
 MOBILE DEVICE

You can store up to eight devices in the headphone device list, and the headphones
can  be actively connected to two devices at a time. You can play audio from only one
device at a time.

NOTE: For the best experience, use the Bose Music app to set up and connect your

mobile device (see page 14).

1.

 Slide the Power/Bluetooth switch to the right l and hold for 3 seconds.

You hear “Ready to connect,” and the status light blinks blue.

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BLUETOOTH  CONNECTIONS
WHAT’S IN THE BOX

2.  On your device, enable the Bluetooth feature.

NOTE: The Bluetooth feature is usually found in the Settings menu.

3.  Select your headphones from the device list.

TIP: Look for the name you entered for your headphones in the Bose Music app.

If you didn’t name your headphones, the default name appears.

QuietComfort 45

Once connected, you hear “Connected to <device name>,” and the status light
glows solid blue for 10 seconds.

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BLUETOOTH  CONNECTIONS
WHAT’S IN THE BOX

DISCONNECT A MOBILE DEVICE

Use the Bose Music app to disconnect your mobile device.

TIP: You can also use Bluetooth settings to disconnect your device. Disabling the

Bluetooth feature disconnects all other  devices.

RECONNECT A MOBILE DEVICE

When powered on, the headphones try to reconnect with the two most
 recently-connected devices.

NOTES:

•  The device must be within range (30 ft or 9 m) and powered on.

•  Make sure the Bluetooth feature is enabled on your mobile device.

CONNECT ANOTHER MOBILE DEVICE

To connect another device, download the Bose Music app (see page 14) or use the
Bluetooth menu on your mobile device (see page 23).

NOTE: You can only play audio from one device at a time.

IDENTIFY CONNECTED MOBILE DEVICES
Slide the Power/Bluetooth switch to the right l and release to hear which device is
 currently  connected.

SWITCH BETWEEN TWO CONNECTED
MOBILE  DEVICES

1.  Pause audio on your first mobile device.

2.  Play audio on your second mobile device.

NOTE: Your headphones receive phone calls from both devices, regardless of

which  device is playing audio.

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BLUETOOTH  CONNECTIONS
WHAT’S IN THE BOX

RECONNECT A PREVIOUSLY CONNECTED DEVICE

1.  Slide the Power/Bluetooth switch to the right l and release to hear which device

is connected.

2.  Within 2 seconds, slide the Power/Bluetooth switch to the right l and release

again to connect to the next  device in the headphone device list.

3.  Repeat until you hear the correct device name.

You hear a tone that indicates when the device is connected.

4.  Play audio on the connected mobile device.

NOTE: If two devices are already connected to the headphones, the newly-connected

device replaces the second device that was previously connected.

CLEAR THE HEADPHONE DEVICE LIST

1.  Slide the Power/Bluetooth switch to the right l and hold for 15 seconds, until you

hear “Bluetooth device list cleared. Ready to connect.”

2.  Delete your headphones from the Bluetooth list on your mobile device.

All devices are cleared and the headphones are ready to connect.

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WIRED CONNECTIONS

CONNECT THE AUDIO CABLE

Use the 2.5 mm to 3.5 mm cable to connect a non-wireless device or to continue using
the  headphones if the  battery is depleted.

1.  Connect the cable into the 2.5 mm port on the left earcup.

2.  Connect the other end of the cable into the 3.5 mm port on your device.

NOTE: You can use the headphones powered on or off when the the audio cable

is connected.

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BATTERY

CHARGE THE HEADPHONES

1.  Connect the small end of the USB cable into the USB-C port on the

right earcup.

2.  Connect the other end into a USB wall charger.

NOTES:

•  When the headphones begin charging, the status light blinks white for 10 seconds.

When fully charged, the status light glows solid white.

•  The headphones don’t play while charging.

Charging time
Allow up to 2.5 hours to fully charge the headphones.

Hear the battery level
Each time you power on the headphones, a voice prompt announces the battery level.
When the headphone battery is low, you hear “Battery low, please charge now.”

NOTE: To visually check the battery, see the status light  l ocated on the right earcup.

For more information, see “Battery status” on page 29.

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HEADPHONE STATUS

The status light is located on the right earcup.

 Headphone
status light

BLUETOOTH STATUS

Shows the Bluetooth connection status.

LIGHT ACTIVITY

SYSTEM STATE

Blinking blue

Ready to connect

Solid blue (10 seconds)

Connected

BATTERY STATUS

Shows the battery level.

LIGHT ACTIVITY

SYSTEM STATE

Solid white

Solid amber

Medium to full charge

Low charge

TIP: You can also check the battery level using the Bose Music app.

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HEADPHONE STATUS
WHAT’S IN THE BOX

CHARGING STATUS

Shows the charging status.

LIGHT ACTIVITY

Blinks white 2 times

Solid amber

Solid white

SYSTEM STATE

Charging begins

Charging

Full charge

UPDATE AND ERROR STATUS

Shows the update or error status.

LIGHT ACTIVITY

SYSTEM STATE

Fast blinking white (10 seconds)

Updating software (via USB)

Slow blinking white (30 to 60 seconds)

Updating software (wirelessly)

Blinking amber and white

Error - contact Bose customer service

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CONNECT BOSE PRODUCTS

CONNECT A BOSE SMART SPEAKER OR SOUNDBAR

Using SimpleSync™ technology, you can connect the headphones to a Bose Smart
 Soundbar or Bose Smart Speaker for a personal listening experience.

Benefits
•  Use independent volume controls on each product to lower or mute your Bose

Smart Soundbar while keeping the headphones as loud as you like.

•  Hear your music clearly from the next room by connecting the headphones to your

Bose Smart Speaker.

NOTE: SimpleSync™ technology has a Bluetooth range of up to 30 ft (9 m). Walls and

 construction materials can affect reception.

Compatible products
You can connect the headphones to any Bose Smart Speaker or Bose Smart Soundbar.

Popular compatible products include:

•  Bose Smart Soundbar 700/Bose Soundbar 700

•  Bose Soundbar 500

•  Bose Smart Speaker 500/Bose Home Speaker 500

•  Bose Home Speaker 300

•  Bose Portable Smart Speaker/Bose Portable Home Speaker

New products are added periodically. For a complete list and more information,
worldwide.Bose.com/Support/Groups
visit: worldwide.Bose.com/Support/Groups

Connect using the Bose Music app

1.  On the headphones, slide the Power/Bluetooth switch to the right l and hold for

3 seconds.

You hear “Ready to connect another device,” and the status light blinks blue.

2.  Use the Bose Music app to connect the headphones to a compatible Bose  product.

worldwide.Bose.com/Support/Groups
For more information, visit: worldwide.Bose.com/Support/Groups

NOTES:

•  Make sure that the headphones are within 30 ft (9 m) of your soundbar or speaker.

•  You can connect the headphones to only one product at a time.

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CONNECT BOSE PRODUCTS

RECONNECT TO A BOSE SMART SPEAKER
OR SOUNDBAR

Power on the headphones (see “Power on” on page 16).

The headphones try to connect to the two most recently-connected Bluetooth
 devices, including your soundbar or speaker.

NOTES:

•  Your soundbar or speaker must be within range (30 ft or 9 m) and powered on.

•  If the headphones don’t reconnect, see “Headphones don’t reconnect to a

 previously-connected Bose  Smart Soundbar or Speaker” on page 38.

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CARE AND MAINTENANCE

STORE THE HEADPHONES

The earcups rotate for easy, convenient storage. Place the headphones flat into
the case.

1.  Rotate both earcups inward so they lay flat.

Left earcup

Right earcup

2.  Fold the left earcup up toward the headband.

NOTES:

•  Make sure to power off the headphones when not in use.

•  Before storing the headphones for more than a few months, make sure the battery

is fully charged.

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CARE AND MAINTENANCE

CLEAN THE HEADPHONES

Wipe the outside surfaces with a soft, dry cloth.

Don’t allow moisture to get inside the earcups.

REPLACEMENT PARTS AND ACCESSORIES

Replacement parts and accessories can be ordered through Bose customer service.
worldwide.Bose.com/Support/QC45
Visit: worldwide.Bose.com/Support/QC45

LIMITED WARRANTY

Your headphones are covered by a limited warranty. Visit our website at
global.Bose.com/warranty for details of the limited warranty.
global.Bose.com/warranty

To register your product, visit global.Bose.com/register
 register will not affect your limited  warranty rights.

global.Bose.com/register for instructions. Failure to

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CARE AND MAINTENANCE

SERIAL NUMBER LOCATION

The serial number is located inside the right earcup under the scrim. The scrim is the
inner screen that covers and protects the  components inside the earcup.

To view the serial  number, grab the scrim at the top edge and gently peel it away.

CAUTION: Be careful not to press down on or remove any other  components inside

the earcup as this could  damage the headphones.

S/N: 011001000100010AE

S
/

N: 0

1
1
0
0
1
0
0
0
1
0
0
0
1
0
A
E

Scrim

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TROUBLESHOOTING

TRY THESE SOLUTIONS FIRST

If you experience problems with your headphones:

•  Check the state of the status light (see page 29).

•  Charge the battery (see page 28).

•  Increase the volume on your headphones, mobile device, and music app.

•  Try connecting another mobile device (see page 25).

If you could not resolve your issue, see the table below to identify symptoms and
 solutions to common problems. If you are unable to resolve your issue, contact
Bose customer service.

worldwide.Bose.com/contact
Visit: worldwide.Bose.com/contact

OTHER SOLUTIONS

SYMPTOM

SOLUTION

Headphones don’t
power on

Charge the battery.

Headphones don’t
connect with your
mobile device

Battery won’t charge

Disconnect the back-up audio cable.

Disconnect the USB charging cable.

On your mobile device:

Disable the Bluetooth feature and then re-enable.

Delete your Bose  QuietComfort 45 headphones from the
 Bluetooth list on your  device. Connect again.

Move your mobile device closer to the headphones and away
from any interference or obstructions.

Visit worldwide.Bose.com/Support/QC45

worldwide.Bose.com/Support/QC45 to see how-to videos.

Clear the connected devices list (see page 26) and
connect again.

Secure the ends of the USB charging cable.

Try another charging source.

If your headphones have been exposed to high or low
 temperatures, let the headphones return to room temperature
and try charging again.

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TROUBLESHOOTING

SYMPTOM

SOLUTION

No sound

Power on the headphones and charge the battery.

Check the state of the status light (see page 29).

Slide the Power/Bluetooth switch to the right and release to hear
the connected device. Make sure you are using the
correct device.

Move your mobile device closer to the headphones and away
from any interference or obstructions.

Use a different music source.

If two mobile devices are connected, pause your other
device first.

If two mobile devices are connected, move the devices within
range of the headphones (30 ft or 9 m).

Try a locally stored music or video file on your mobile device.

Use a different music source.

Connect another mobile device (see page 25).

Poor sound quality

Disconnect the second device.

Move your mobile device closer to the headphones and away
from any interference or obstructions.

Try a locally stored music or video file on your mobile device.

No sound from a  device
connected by the
 back-up audio cable

Secure the ends of the back-up audio cable.

Increase the volume on your headphones, your mobile device
and music source.

Connect another device (see page 25).

Poor sound quality from
a device connected by
audio cable

Secure the ends of the back-up audio cable.

Connect another device (see page 25).

Action button doesn’t
change the noise
 cancelling mode

Make sure your headphones are powered on.

Use the Bose Music app to change the noise cancelling mode.

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TROUBLESHOOTING

SYMPTOM

SOLUTION

Headphones don’t
connect to a Bose Smart
Soundbar or Speaker

Slide and hold the Power/Bluetooth button until you hear “Ready
to connect another device,” and the Bluetooth light blinks blue.

Make sure that the headphones are within 30 ft (9 m) of your
soundbar or speaker.

Headphones don’t
reconnect to a
 previously-connected
Bose  Smart Soundbar or
Speaker

Delayed audio when
 connected to a Bose
Smart Soundbar or
Speaker

Reconnect a previously-connected device
(see page 26).

Download the Bose Music app and run available
software updates.

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TROUBLESHOOTING

A restore to factory settings can clear all settings and return the headphones to their
original out-of-box state. After, the headphones can be configured as if they were
being set up for the first time.

Restoring to factory settings is only recommended if you are having issues with the
headphones, or you have been instructed to do so by Bose customer service.

RESTORE THE HEADPHONES TO FACTORY SETTINGS

1.  Remove the headphones from the Bluetooth list on your device.

2.  Remove the headphones from your Bose account using the Bose Music app.

NOTE: For more information about how to remove the headphones from your

Bose account using the Bose Music app, visit:
worldwide.Bose.com/Support/QC45
worldwide.Bose.com/Support/QC45

3.  Slide the Power/Bluetooth switch to the right l and hold. At the same time, press

and hold the Action button for 30 seconds.

The LED indicator blinks white. After 30 seconds, the LED indicator blinks amber
to indicate factory settings are being restored (2 to 3 seconds).

4.  When the rest is complete, the LED indicator slowly blinks blue. The headphones

are now in their original out-of-box state.

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©2021 Bose Corporation, 100 The Mountain Road, Framingham, MA 01701-9168 USA
AM869288-0010 Rev. 01