Solar Panel Power 20W AC Output+Solar/AC Input USB to ... shorting out, overload and over discharge or overcharge, the system will automatically protect the function.UPS function, work steady ... MP4, Camera ,speaker,etc.Remote area, Village, Country area, Camping ,Adventure Activity etcFeatures Solar power charge, easy to useLong working ... once in 3 months Ultralight Ultrathin Portable solar power system