Logic3 i-Station Dock and Speaker Station for iPod Combines subwoofer, dynamic tweeter speakers, and 3-D surround sound processor Recharges iPod battery while music plays Powered by AC adapter (included) or 4 AA batteries Synchronizes with PC or Mac via USB or FireWire cables Compatibility: iPod nano (1G only), iPod mini, 3G iPod, 4G iPod with click wheel, iPod Color, iPod Video