The Power Matrix is an external power supply for iPhone & Android phones. It also acts as an external power docking station for ANY iPhone. Go hands free with video or talk while charging with the Apple MFi plug, or use the built in micro USB cable for compatible smartphones. The Matrix has a 3000mAh lithium battery, thus providing portable power and approximately 19 hours of data, 25 hours talk, and 67 hours of extra media. 4 LED indicator lights are each equivalent to 25% power and more.