quoted from woot.com
Specifications:
Compatibility: iPod, iPhone, Most devices with a 30-pin USB cable
iPhone compatibility: iPhone, iPhone 3G, iPhone 3GS, iPhone 4
iPod compatibility: iPod with docking connector (iPod Classic / iPod-5th generation / iPod nano-1st, 2nd, 3rd, 4th and 5th generations / iPod touch-1st and 2nd generations)
Cheers! 