The TuneCast II FM transmitter features FM frequencies 88.1-107.9MHz and Auto ON/OFF. It also memorizes up to four FM frequencies to give you easy and quick access to your favorite songs. The TuneCast II comes in two models: a white version and a gray version. The gray version, TuneCast� II Mobile Transmitter (F8V3080; ESP $49.99) , ships with a Belkin Mobile Power Cord that connects to your car’s cigarette lighter to provide extended power while on the road. The white version,TuneCast� II Mobile Transmitter (F8V3080-APL; ESP $39.99), includes only a DC cable for optional battery-free operation. The DC cable plugs into the DC jack on the Mobile Power Cord (F8V7067-APL; ESP $19.99 ) for iPods with Dock Connector.