Original XIAOMI 5.1V 2.1A 10000mAh Power Bank For Smartphone (Red) Compatible with iPhone, HTC, Samsung, smartphone and Tablet PC(the power bank will adjust the output power automatically to meet different devices' needs). Human engineering round conner design, more comfortable to handle. With anodic oxidation technology, the color will keep fresh. Short-circuit Protection, Input Overvoltage Protection, Output Over-Current Protection, Onput Overvoltage Protection, Over-charge Protection. Four LEDs to show battery level.