It adopts Bluetooth 5.0 version, which has stronger compatibility and stability, and provides a stable connection of 10m without delay Compared with the FM Bluetooth transmitter, the signal transmission through the aux port is more stable, faster, and the Bluetooth connection is simpler Compared with the 3.5mm adapter required for Bluetooth adapter connection, the adapter is easy to lose. This has a 1.2m spring wire, which is easy to store and use (the spring does not stretch 40cm) Support hands-free communication, let go to make driving . Built-in high-definition noise reduction microphone, clear calls without USB power supply directly, no need to worry about lack of power and battery life Transmission rate: 5.0 (Mbps) Working frequency: 5 (MHz) colour: black Material: ABS Size: 8x5x3cm Package Contents: 1 x Bluetooth adapter Only the above package content, other products are not included. Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.