Key Features : InPut DC 5V 1A OutPut 5V 2.1A 15000mAh  Fashion backup battery for phone， camera，mp3，mp4， and other digital devices. Built-in protecting circuit against over-current， over-heat and over-voltage， can ensure security. Light weight and small size， easy to carry Portable， Safe and reliable; perfect for using on travelling and indoor ot outdoor activities.