Colour: Black Transmission rate: 10 (Mbps) Charging time: 1 hour Playing time: 5 hours Working distance: 10m (barrier-free) Bluetooth Standard: 5.0 Body size: mm Length: 78 Width: 23 Thickness: 16 Input/output port: 3.5mm audio port Drivers: No need to install Function: Bluetooth audio adapter integrating receiving/transmitting One-key operation, easy connection, convenient and fast Small body, close to the body Easy to connect in the car, drive freely Driving use: When driving, the mobile phone is connected to the B12S through Bluetooth, and after inserting the audio cable into the car, you can use the car audio to enjoy music, and it is more convenient and safe to answer the phone and listen to music. Traditional audio use: connect to the AUX audio port or RCA audio port, and the audio without Bluetooth function can also be transmitted wirelessly.