This is a lightweight portable charger for users on the go. Simply plug it into your car's cigarette lighter, place your iPod, iPod Mini and Video securely in the adjustable cradle and connect the cable to your unit to charge. The unit also has a built-in FM transmitter which allows you to play your iPod tunes over your car's stereo system. Tune your car radio to the clearest FM frequency, and enjoy you digital music with full stereo sound and convenience. The digital tuner locks digitally into the clearest available radio station.