... the helmet Bluetooth headset, a total of 4 device, the otherCable connection 1 way device.2, Bluetooth wireless connectivity 2 ... :In 1, the Bluetooth device priority:All equipment for Bluetooth wireless connectivity, priority: mobile phone - before and after talkback - ... short by adjust the headset volume, long press end number redial.Six, increase the walkie-talkie wireless PTT function:The function ...