RoadTrip holds your iPhone or iPod securely in place on a flexible steel neck, in a cleverly-designed cradle that accommodates most cases (so you won"t even have to take it out of its case). RoadTrip uses a powerful FM transmitter to send the music wirelessly to your car"s FM radio, so you and the whole car can enjoy it through your stereo speakers. And while you"re enjoying the music, your iPhone or iPod is enjoying a battery-charge.Griffin innovations and user-centric design make the difference: like SmartScan, a Griffin feature that finds the best FM frequency and performs the setup for you. You can save the most useful frequencies as presets and recall them at the push of a button. And Griffin SmartSound technology analyzes the signal and adjusts the output to make sure your music always sounds great. RoadTrip also puts track controls at your fingertips. Play, pause, skip tracks forward and backward from RoadTrip"s buttons, and your eyes never have to leave the road.