Connect this item to your car stereo system via the aux-in port. Then turn on your phone/tablet bluetooth and connect it to the bluetooth receiver. Once connected, you can play the music or audio from the device on the car stereo system wirelessly.
2m Pro Audio Metal 3.5mm Stereo Jack to 2 RCA Phono Plugs Cable Gold 
Male stereo Jack to two male mono RCA phono plugs. Jack (headphone jack) to two phonos (RCA) plugs. Using pure copper cables, metal ends and gold plated connectors, kenable pro audio range gives you a quality far beyond comparably priced cables.