General Spec Brand iJacket Type rechargeable external backup battery case/power pack Capacity 1400mAh Input DC 5V/1000mA(Max) Output   DC 5V/400mA Charging Time about 4 hours Standby Time up to additional 270 hours Talk Time 2G up to 12 hours Talk Time 3G up to 6 hours Audio Play up to 36 hours on 3G Video Play up to 9 hours on 3G Compatibility iPhone 4G Others built-in 1* LED indicator and come with a USB charging cable Features High capacity, long standby and light-weight. Offer a unsealed coverage protection against scratches, dirt and shocks. Allow you to always have a battery charging backup when you are away from a AC outlet. Convenient built-in rechargeable battery to power up your iPhone. With a LED indicator for showing the capacity of battery. Custom-fit with open-face design, easy access to all the device features without removing the case. Powered via the USB charging cable .