Griffin RoadTrip FM Transmitter and Car Charger for iPod (Black) Compatibility: iPod nano (1G only), iPod mini, iPod 3G, iPod 4G with click wheel, iPod color, iPod video Convenient one-piece transmitter and charger module uses any frequency from 87.7 to 107.9 MHz Backlit screen shows which frequency RoadTrip is currently broadcasting Transmitter can be removed and used with a Mac or PC computer Plugs into any auto power outlet or lighter adapter