Features:
1. External 1900mAh Li-Polymer battery inside Case.
2. Provides some mechanical protection for your IPhone.
3. Lightweight and thin design.
4. Power indicator located on the rear of case (Each LED represents 25% of Case Battery Charge).
5. Charge using included mini usb cable which you can plug into either apple power adapter or PC usb port.
6. Allows data sync through mini usb cable so you won't need to remove case.
7. Can charge IPhone and Case at same time or separately once removed to charge twice as fast.

Specifications:
1.Dimension: 12.5 x 63 x 16 mm
2.Weight: 65g
3.Output Voltage: 5V
4.Output Current: 500mA
5.Input Voltage: 5V
6.Input Current: <= 1000mAh (1A)
7.Capacity: 7.2 WH (1900 mAh)
8.Standby Time: Up to 230 hours
9.Talk Time: Up to 6 hours
10.Internet Use: Up to 5.5 hours on 3G / Up to 8 hours on Wi-Fi
11.Audio playback: Up to 30 hours
12.Video playback: Up to 8 hours

Actual battery life will depend on usage and what applications are running in the background of phone.

The IPhone 4 / 4S Battery Case is provided in a plastic gift box and contains:
* Battery Case
* Mini usb cable
* Instructions