Tunecast Auto Universal FM Transmitter for MP3 Players Play music stored on your MP3 player through your car's FM tuner using this lightweight transmitter with an easy-to-read display Just plug into your player's headphone jack and you're ready to go Comes with a 12-volt car adapter to keep TuneCast Universal powered while you drive Includes an adhesive-backed mounting bracket and a 3.5mm stereo headphone plug Compatible with all iPod models, iPhone 3G, iPhone 3GS, and iPhone 4