... the best and convinient way for yourself Specifications&FeatureProducts NameExternal battery packCompatibilityIPhone 4/4sColorBlack,White,Red,Pink,Blue Capacity2400mAhInput DC5VOutput DC5VCharging ... .* Portable, convenient, easy to use, high capacity* Rechargable.* Five color for choosing.HOT SELL Rechargable Battery pack for IPhone 4/4S Shenzhen ONSUNWA ...