Power up in style with Aluminum Cover, and 4 status LEDs keep you informed of remaining capacity. Pure and compact 10400mAh power bank for most efficient charging. Overcharge protection, short circuit protection. With such massive capacity and compact design, it's perfect for travelings or anytime you're away from an outlet. Super-fast charge output, through USB port, synchronous rectification output, working efficiency is higher than 91%, product NO heat when in operation