General Spec Type external backup battery Capacity 1900mAh Input DC 5V/800mA Output   DC 5V/500mA Charging Time 2-4 hours Compatibility all iPhone and iPod series Features Compact, stylish and light-weight. Allow you to always have a battery charging backup when you are away from a AC outlet. Leave it plugged in to your phone and let it charge your phone on the go. Convenient built-in folding stand to watch videos on your iPod/iPhone. With four LED indicators for showing the capacity of battery. Powered via USB cable (not included).