USB Docking connector works with:
iPod touch (1st, 2nd, 3rd, and 4th generation), iPod nano (2nd, 3rd, 4th, 5th, and 6th generation), iPhone 4, iPhone 3GS, and iPhone 3G.
AirPlay works with:
iTunes, iPod touch (2nd, 3rd, and 4th generation), iPhone 4, iPhone 3GS, iPhone 3G, iPad 2, and iPad.
For AirPlay, the iW1 must be connected to Wi-Fi with networked access to a Mac or PC running iTunes 10.1 or later; or an iPad, iPhone, or iPod touch running iOS 4.2 or later.
iHome Apps:
iHome+Sleep and iHome+Radio, and iHome Connect apps only work with iPad, iPhone, iPod touch and requires iOS 4.0 or later