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 & Play2 RCA SteckerBluetooth: V5.0Range: 10mSet up with auto-pairing in a minuteExisting CD changer can still be usedFunction via Bluetooth-enabled devicesFits to following all vehicles with RCA input on the RadioSuitable for most carsColour:blackMaterial:ABSPackage Contents:2 x Bluetooth Adapter CableInstallation info:1. Connect red wire to 12 volt ignition power2. Connect black wire to ground/metal chassis3. Connect rca to rca inputs of the source device4. Go to phone and pair it5. Ready to goOnly 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.