Features: The Bluetooth-compatible module is made for RD4 radio Just plug the 12pin connector into 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-. Match your phone or pad to Bluetooth-compatible module.and Choose Aux from your radio, then you can use your phone to for through car speakers. You can hear music from your phone/pad/mp3(They should have blueooth function).<br><br>: Bluetooth-compatible Version: 5.0 Port: 12Pin Microphone length: 150cm Material: plastic colour: Black<br><br>Package Contents: 1 Set Bluetooth Adapter<br><br>Only the above package content, other products are not included. Note: Light reflection 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.