Naztech Stereo Music Dock and Charger for Apple iPhone, iPod and iPad (N27-11799) Charge Your Device While You Listen iPhone Call Prompt Feature Ultra-high Reliability with Sleek Design Piano Black Finish Specifications: Input: 100-240V, Output: 5V 2.1A, Frequency: 150Hz~20KHz Protection: Short Circuit/Over Charge Compatible with: Apple iPad, Apple iPad 2, Apple iPhone, Apple iPhone 3G, Apple iPhone 3Gs, Apple iPhone 4, Apple iPhone 4 CDMA, Apple iPhone 4S