I was looking for a solution to play my favorte MP3's in my roadster without replaceing my factory radio or doing a ton of wireing. Well I found a very cool solution and it works perfect! I went to Radio Shack and I bought a 12 volt cigarette lighter MP3 player that you connect to your home computer via your USB jack and then upload your favorte MP3's to the FM player in the supplied USB cord. Once loaded you tune your Crossfire's radio to your desired unused FM station and it broadcast via FM signal to your radio no wireing needed. It holds 2GB of music and works excellant using the factory radio.