This is the Scosche freqOUT Digital FM Transmitter for iPod, iPhone FMTD7. The freqOUT allows you to play music through your car stereo from your iPod or iPhone. The innovative design of the freqOUT lets you charge your iPod or iPhone while you play music. This digital FM transmitter plugs directly into the bottom dock of your iPod or iPhone to provide a clear and crisp audio signal. For devices without a 30-pin dock, use the included aux cable to plug directly into any headphone jack. The freqOUT is powered through any 12v power socket in your vehicle. An integrated cable then connects your iPod or iPhone for easy charging.