Compatible with: iPhone 3G/3Gs 8GB/16GB/32GB, iPhone 2G 4GB 8GB 16GB, iPod Touch 1st -3rd Gen, iPod Nano, iPod Classic, iPod Video

Specifications:
Battery Type: Lithium-ion battery
Battery Capacity: 1900 mAh
Input Voltage: 5.5V +/- 0.5V
Output Voltage: 5.0V +/- 0.5V
Input Current: 500mA MAX
Output Current: 800mA MAX
Dimension: 67×62x15MM
Weight: Approx. 48g
Charge Time: Around 2 hours

* LED indicator for charging
* LED indicator for battery power level
* No memory effect, Li-ion battery built-in
* Charged via the computer or AC adapter with the USB cable, easy to take and charge
* Color: Black
* Compatible with iPhone, iPod series

External Portable Power Source Battery/Charger for Apple iPhone 4