External battery for Iphone 4 1,Full Capacity:1700mAh 2,portable external battery 3,CE ROHS 4.Out-put 5V 0.5A External battery for Iphone 1,Capacity:1700Mah2,portable battery3,CE ROHS Features: Output:DC5v 500mAInput:5V 500mACapacity:1700mAh(can be customised with different capacity)Charging Time:4~6 HoursEasy to operate,plug into it and get charged