Just plug the connector into（ACC/GND）AUX the socket back of your radio | You can just Insert this item to the back radio then Connect the red wire to 12V+, the black wire to 12V-. | bluetooth 5.0 version, also support 3.0 /2.0, fits WMA, WAV, FLAC. | Choose AUX from your radio and you can play music from your phone in your car. | Match your phone or pad to bluetooth module.and Choose Aux from your radio, then you can use your phone to play music through car speakers. You can hear music from your phone/pad/mp3(They should have blueooth function)./ | If you have any problems, please feel free to contact us.