Xiaomi 9.9 mm Slim 5000mAh Portable Power Bank Aluminum alloy shell. Smooth, ebony varnish allows you to power up in style 4 status LEDs keep you informed of remaining capacity Use a 5V / 2A adapter (not included) for fastest charging Super-fast charge output (5.1V / 2.1A total) through USB ports Detects when the charger is inserted incorrectly and will automatically stop charging