I hate to be the one to tell you this, but cheaper is not always better. Your sound will be dramatically reduced thanks to the conversion from digital to frequency modulation (FM). You would be FAR better off sound wise using a component type head to run your MP3 CDs. But it is easy for me to spend your money. That choice is yours. If you really don't care about sound quality, then go for the FM modulation. If you do care about sound quality, go component system with RCA connectors. The FM modulator should have a simple two to three wire connection and attach in line with the vehicle's antenna wire. You generally have to set the radio to a specific frequency band to receive the FM modulated signal.