Adding a Bluetooth headset or speaker/mic button for Android
Starting with Android version 3.67, we've simplified the configuration steps for adding accessory and device buttons.
To add a button:
1. Make sure you've plugged-in or paired your device through Android settings. Every accessory may pair differently, so read the pairing manual for your accessory.
2. Open Zello Options > Push-to-talk buttons.
3. Tap Add button and then press the button on the phone or accessory you want to connect.
4. If using a Bluetooth device with audio and microphone, please make sure you select the Bluetooth option from the talk screen.