This product is specially made for car audio/stereo. Just connect the power to the battery and plug the two RCA into the car radio,connect your phone with bluetooth. You can just Insert this item to the back radio then Connect the red wire to 12V+, the black wire to 12V-. 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). Special Features: Plug & Play 2 RCA Stecker Bluetooth: V5.0 Range: 10m Set up with auto-pairing in a minute Existing CD changer can still be used Function via Bluetooth-enabled devices Fits to following all vehicles with RCA input on the Radio Suitable for most cars Colour:black Material:ABS Package Contents: 1x Bluetooth Adapter Cable Installation info: 1. Connect red wire to 12 volt ignition power 2. Connect black wire to ground/metal chassis 3. Connect rca to rca inputs of the source device 4. Go to phone and pair it 5. Ready to go Only the above package content, other products are not included. Note: Light shooting 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.