... monitoring and display power microcomputer , speed shuttle, all the features of a key operation can be realized 3 ... prevent power loss; a machine can, for all devices with USB charging, such as mobile phones, MP3, MP4, ... no need to bring a variety of chargers, random with 10 kinds of charging head; popular Tablet PC, ... *26*29CM Luxuriant surface special battery for the market's phones +music players+ GPS