Headphones User Manual
17
Tab 6, 14
English Tab 2, 10 Tab 3, 11 Tab 4, 12 Tab 5, 13
Tab 8, 16Tab 7, 15
USING THE HEADSET
Auxiliary (AUX) audio input
The Bose
®
 A20
®
 Aviation Headset provides a 
1
/8 inch (3.5 mm) AUX audio input 
that allows you to use your headset with an external audio source such as a 
portable GPS or a portable audio device. The connector is located at the 
bottom end of the control module as shown. 
Your headset includes a 
1
/8 inch (3.5 mm) adapter cable to connect your 
external audio device. Plug one end of the adapter cable into the headphone 
plug on your device and the opposite end into the headset AUX audio input.
Note: None of the functions of a connected audio source are controlled by the 
control module. 
Note: This feature will not work unless the multifunction switch is turned on.
Note: When the headset is running on battery power only, and it is not plugged 
into an intercom, it will shut off even when there is an auxiliary audio input signal 
present. To use the headset when unplugged from the intercom to listen to 
auxiliary input audio or as a Bluetooth
®
 wireless technology headset to make or 
receive calls, we recommend you disable the Auto Off feature for uninterrupted 
functionality.
Audio priority
The Bose A20 Aviation Headset allows you to decide the priority of the audio 
sources you want to hear while using the headset. On the Bluetooth control 
module, the audio priority is controlled by the multifunction switch. On the 
conventional control module, the audio priority is controlled by the audio 
priority switch.
AUX audio
input
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