You can set a Bluetooth button as the PTT key to use while Zello is running in the foreground. Go to Zello Options > Push-to-talk button > Bluetooth PTT control device and then select the desired Bluetooth device.
Press and hold doesn't work with Bluetooth, but you can use the Bluetooth button to talk under these conditions:
- The headset supports A2DP and AVRCP and has media control buttons (Play / Pause / FF / RWD)
- Enable "Toggle" under Push-to-talk button action.
Then press once to start talking and press again to stop.