Now you can play tunes from your iPod or other portable audio device through any FM stereo receiver. Just find an available frequency (not broadcasting a clear signal), and set your TuneCast II to it. Set up to four different frequencies in TuneCast II's programmable memory to make it easy to find the clearest station, wherever you go. Our unique auto ON/OFF function frees you from having to manually toggle the switch--it simply powers on when an audio signal is detected. If no signal is detected for a period of 60 seconds, your TuneCast II switches off. This innovation preserves battery life while making your outstanding mobile audio experience simpler to enjoy.We include a Belkin Mobile Power Cord that connects to your car's cigarette lighter and lets you can preserve your batteries* as you play your tunes on the road (does not charge the batteries).