This powerful TP-LINK 10400MAH Power Bank will help you keep your devices at full power performance at any time. This power bank features dual USB ports to allow for simultaneous charging of two devices, and a built in special circuit provides full speed for your smartphone. The TP-LINK Power Bank also greatly reduces unnecessary energy loss, ensuring up to a 90% efficiency rate, and the multiple protections of short-circuit, over-charge, over-discharge, over-current, over-voltage, and over-heating ensure safe and reliable charging for all of your devices. This power bank also features a built in flash light, and a Smart LED indicator, which shows battery level or charging status.