EXCALIBUR 144 Soundmaster FM Transmitter. Use your cars stereo system to play tunes from your iPod, without worrying about installation hassles or messy wires. Just plug our FM Transmitter into your autos standard power-adaptor. Then connect your iPod to the 30-pin connector to transmit your favorite music, in stereo, from your iPod directly through the speakers in your car. And while you are enjoying the music, you will charge your iPod. Works with all brands of MP3 players, using the auxiliary port.