Your controller supports headphones and headsets.
Plug the headphones (3-pin) or headset (4-pin) into the 3.5-mm jack on the back of the controller. When headphones are used, the internal microphone on the controller is available for voice search and chat. When a headset is used, the headset microphone is used for voice search and chat.
NOTE
When multiple controllers are connected to the same SHIELD device,
only one controller can receive audio through the headset jack. If you
are gaming or sharing media with other people, unplug the headphones so
everyone can hear.
The headset jack provides independent volume control from your Android device and maintains your previous headset volume level the next time you use your headset.