General Spec Brand DXPOWER Model WT-i1700B Color black Capacity 1700mAh Output 5.0V/500mA Input 5.0V/500mA Charging Time 3-4 hours Standby Time more than 210 hours Talk Time 2G Up to 10 hours Talk Time 3G Up to 5 hours Audio Play Up to 28 hours Video Play Up to 7 hours Compatibility iPhone 4 Features Compact, stylish, safe and light-weight. Designed to fit the contour of iPhone 4 precisely. Ultra slim and custom-fit with open-face design for easy operation. You can charge your iPhoen4 in the case. Doubles battery life of iPhone 4G. Four Indicator lights, once all the lights are lit, it means the case is fully charged. Press the smart switch for 3 seconds, then it is on, your iPhoen will consume the power in the backup battery first to extend built-in battery life, press the smart switch for another 3 seconds, then it is off. Can protect your phone from scratching and dirt. Easy access to all buttons, controls and ports.