The XtremeMac Incharge FM FM Transmitter (Black) transmits and charges any docking iPod or iPhone model. Simply connect the transmitter's adapter to your vehicle's cigarette lighter or accessory outlet and connect the docking connector and USB cable to your iPod and the adapter. Your player will charge while it plays through your car's FM stereo. Smart-Tune auto channel select helps to find the clearest frequencies and 2 programmable presets can be set when you find the best stations. In addition, you can choose between stereo or mono modes for the best reception possible.