User Manual
Table Of Contents
- About your Bose® A20® Aviation Headset
- Components
- Preparing the Headset for Use11
- The battery compartment
- Connecting the headset to the aircraft
- Wearing and adjusting the headset
- Using the control module
- Primary and secondary audio sources
- AUX audio sources (wired)
- Bluetooth® audio sources (wireless)
- Using the headset with a Bluetooth® device
- Pairing the first device
- Pairing another device
- Switching between connected devices
- Bluetooth multi-function button
- Making and answering calls
- Reconnecting to a previously connected device
- Recovering a lost connection
- Disconnecting a Bluetooth device
- Clearing the headset pairing list
- Controlling Bluetooth volume
- Using the headset with a Bluetooth® device
- Secondary audio modes
- Cleaning the headset
- Instructions for continued airworthiness
- Managing multiple secondary sources
- Ordering parts and accessories
- Contact information
- Limited warranty
- Locating the headset serial number
- Mounting the aircraft panel connector
- Replacing parts
- Microphone windscreen

Using the Headset
18 - English
Using the control module
If you purchased the Bluetooth
®
version of the headset, you received the Bluetooth
control module. If not, you received the conventional control module.
Bluetooth
®
control module
Conventional control module
Left/Right
Intercom Volume controls
Power indicator
Power button
Bluetooth
Volume Up button
Auxiliary (AUX)
audio input
Bluetooth
Volume Down button
Bluetooth
indicator
Bluetooth
multi-function
button
Secondary
Audio
Mode selector:
Mute
Intercom
prioritized over
secondary
sources
Mix
Intercom
mixed with
secondary
source(s)
Off
Intercom only
Mute
Intercom
prioritized over
secondary
sources
Mix
Intercom
mixed with
secondary
source(s)
Off
Intercom only
Secondary
Audio
Mode selector:
Power button
Action What to do
Turn on the headset
Press
once.
Turn off the headset
Press and hold
for three seconds.
Note: When powered off, the headset will still provide pas-
sive audio communications.
Note: Repeated pressing will not speed up the power off
event. If the unit does not power off, wait 3 seconds
try again.
Dim the power and
Bluetooth indicators
Press
twice quickly. Repeat to brighten.