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-inch (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.