iTrip Auto Universal Plus lets you listen to your MP3 player through your car?s stereo speakers. We call this one "universal" because it works with virtually any MP3 player that has a 1/8" (3.5mm) headphone jack. And the plus means you can power and charge your player using your own charge/sync cable and an included USB port on the 12 Volt power adapter. FEATURES: Listen to your MP3 player on your car stereo. 12V power plug works with any cigarette lighter socket. Simple 3-step setup. Lighted display is easy to read. Included USB port lets you charge using your own charge/sync cable. Power switch with 3-color charge indicator. Save frequencies to four pre-sets; uses any FM frequency from 88.1 to 107.9.