This external backup battery is perfect to provide power for iPhone 4 4S anytime anywhere. Features: External battery charger case for iPhone 4 4S 4G. Full body coverage protection for your iPhone 4 4S 4G. Works as both an extended iPhone battery set and a protection case. Protective and powerful. Suitable For: iPhone 4 4S 4G Specification: Capacity: 2350mAh Cell type: Li polymer battery Lithium-ion Input: DC 5V. 1Ah (max). Output: DC 5V. 1Ah (max). Talk Time: Up to 7 hours Internet Use: Up to 6.5 hours on 3G & Up to 9 hours on Wi-Fi Size: 130(L)*60(D)*18(T) mm. Net Weight: 70g Color: White Package Includes: 1 x External Battery Case for iPhone 4 4S 4G Note: the iPhone is not included.