Powerful Capacity Powerful capacity of 10400m Ah lets you charge a smartphone 3~5 times, keeping your devices running all the time. * Actual number of charge times depends on your device's battery size. Simultaneously Super-fast Charging Dual USB (Universal Serial Bus) ports (5V/2A & 5V/1A) allow for charging two devices simultaneously. Built-in special circuit provides full speed for your smartphones. Reliable Power TL-PB10400's multiple protections of short circuit, over-voltage, over-current, over-charge, over-discharge, & over-heating ensure safe & reliable charging to avoid any potential harm to your devices. High Energy Efficiency Rate Combining high quality circuit, TL-PB10400 greatly reduces unnecessary energy loss while charging, ensuring up to 90% energy efficiency rate. So under full capacity, it can charge a smartphone for 3~5 times, ideal for extended use of mobile devices. Practical Functions for Convenience Smart LED Indicator: Four LED lights work as charge indicators to show battery level or charging status Practical Flashlight: Built-in flashlight comes in handy for in-house & off-road activities Universal Compatibility Compatible with almost any smart devices like iPhones, iPads, Android smartphones & other 5V input USB (Universal Serial Bus)-charged devices.