1. This cable is with Bluetooth module;2. This product is specially made for car audio/stereo, it's a replacement of -237B Full Speed AUX Input. 3. Can be used with // radios if only there is socket for our connector and it has AUX function;4. Just plug the connector into the back of the radio,connect the two wires with 12V+(red), 12V-(black). 5. Choose Aux from the panel and connect your phone or mp3 with bluetooth;6. You can enjoy the music from the phone or mp3 pad and more.(They phone should have Bluetooth function.) 7. Bluetooth 5.0 version, and compatible with 2.0 3.0 4.0 other versions of Bluetooth, can support the commonly used MP3 format audio, but also support the WMA WAV FLAC, and other high-quality audio format decoding, non-ordinary Bluetooth functions, can support DSD large capacity transmission. 8. In addition, of QQ music, KuGou music, film, map navigation can be transmitted to the car, which can only transmit the sound, not play the image on the car. Car Radio -237B Full Speed AUX Input Replacement 3.5MM Audio MP3 Bluetooth 5.0 Microphone Adapter for This bluetooth adapter helps to play phone music through car radio and supports call answer by microphone. Specifications: Bluetooth module connector: 12V Cable length: 20 cm colour: black Material: ABS Package Contents: 1 x Audio Cable Adapter 1 x bluetooth Microphone 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.