iTrip Auto combines Griffin's renowned FM transmitter technology with an integrated charger that plugs into your car's cigarette lighter or accessory socket. Griffin innovation and user-centric design makes setup quick and easy: Just press the SmartScan button and tune your car radio to the frequency shown on iTrip's easy-to-read lighted display. It's that simple. But, as easy as it is to use, iTrip Auto gives you plenty of control. Use iTrip Auto as an inline remote to play/pause and skip through tracks. User-selectable stereo and mono modes let you select for optimum signal, and Griffin SmartSound technology optimizes the signal for best sound. iTrip's programmable presets let you save the most useful FM frequencies for quick recall. And the one-piece integrated cable means everything stays together and nothing gets misplaced. For iPhone and iPod touch, iTrip even comes with a software app that lets you control it from your Multi-Touch display. It's an industry-first hardware/software integration, and it's a free download from the iTunes App Store