Solar Panel Power 20W AC Output+Solar/AC Input USB to charge mobile phones,MP3/4 speaker,etc Long ... out, overload and over discharge or overcharge, the system will automatically protect the function.UPS function, work steady ... It's used to provide electricity for lamps, laptops, mobile phones, TV, fans etc. USB to charge Mobiles, MP3 ... in 3 months Ultralight Ultrathin Portable solar power system