If your car radio can receive FM radio broadcasts, you can use the FMC250 hideaway unit to control a Clarion CD changer… and the FMC250 will take the sound from the changer and play it through your radio. Connect the FMC250 between your FM radio antenna input and your antenna… tune your radio anywhere from 87.7 to 89.9 MHz…. and you’ll hear CD sound from the changer.