3200mAh External battery charger case for iPhone 4 / 4s. Brand new and high quality, Light Weight, Ultra thin fashion design. 4 LED lights indicates the power level remaining the case (Each light represents 25% of remaining power). Conveniently located "on and off" button to let you decide when you want to charge. Protect function: short circuit, over-current, over-charging and over-discharging. Connect the USB to a powered USB equipment or computer. Battery itself charged through USB port or USB charging adapter. Sealed design and very convenient to use. Full body coverage protection for your Phone. Works as both an extended Phone battery set and a protection case. Used for charging your Phone anytime and anywhere.