Plug RoadTripâ„¢ into your dashboard power socket and listen to your iPodÂ® on your car’s stereo system! RoadTrip serves as a convenient cradle and charger for any iPod. Set the transmitter to send your iPod’s music or audiobook to any available FM frequency between 88.1 and 107.9 on you car radio. The backlit screen confirms the frequency. Or plug the included USB and audio cable into your Mac or PC and stream your iPod contents as far as 40 feet to an FM stereo! Measures 2 1/2″ x 1 1/2″ x 4 3/4″.