UFQ BT-Link aviation headset bluetooth adapter Turn ANY non-Bluetooth pilot headset into a bluetooth headset add bluetooth to aviation headset pilot headphone compare to bxxlink ii and better than bxxlink ii Three types Audio Priority Modes AUTO,Mix,Mute Bluetooth 5.0 allows you to connect to two devices at the same time with a young girl’s voice prompt,With 2 different power supply choices, besides 2 x AA batteries, also have USB type C external power source input, to by pass batteries for power USB POWER, you can use together with Power bank so can last for MANY hours