ATC 1900mAh Supreme Slim Light Weight Power Case & Extended Rechargeable Battery for iPhone 4/4S Blue&Black(Fits AT&T/Verizon) with USB Charging Cable
Rechargeable lithium polymer iPhone 4 / 4S external battery charging case Full body coverage protection for your iPhone Works as both an extended iPhone battery and a protection case Protective and powerful Full Body Coverage for iPhone 4 / 4S Lightweight, ultra slim design Non slip comfort grip Automatic tests function Capacity:1900 mAh Output voltage: DC 5V Output current: 700mA max Fully charged in 3 Hours Four lights indicates the power level remaining the case (Each light represents 25% of remaining power) Sleek, Low-Profile design ; Rechargeable up to 500 times Comes with USB cable