Griffin NA23129 PowerBlock Plus 2.1A for iPhone - Original OEM - Retail Packaging - Black Cable length: 3.5 ft. Input Voltage Range: 110-240 volts AC Output Voltage: 5 volts DC at 2.1 Amps Compatible Apple iPad, iPad 2, iPad HD 3, iPhone, iPhone 3G, iPhone 3G S, iPhone 4 OEM Part Numbers: NA23129