Bluetooth 5.1 AUX Car Adapter USB to 3.5mm Jack Dongle Cable Handfree Car 1393
After successful Bluetooth connection, the green light flashes slowly. Bluetooth version protocol: V5.1a2dp/avctp/avdtp/avrcp/hfp/spp//att//gatt/rfcomm//12cap. Call function: Support, USBA male head with built-in silicon microphone.