iTrip Auto Universal Plus broadcasts your MP3 or other portable music player to your car's FM radio, so the whole car can listen through your stereo speakers. The "universal" in the name means that it works with virtually any MP3 or audio player that has a standard 1/8" (3.5 mm) headphone jack. And the "plus" in the name means it includes a USB port so you can power and charge USB-powered players using your own USB charging cable. Choose between LX or DX (stereo or mono) modes to get the output level that sounds best under real-world conditions. iTrip Auto Universal Plus plugs into your car's cigarette lighter or 12 volt accessory socket, so when you get where you're going, you arrive with a fully charged player.