500va 300W Back-Upups Power Supply for Computer Laptop

500VA 300W back-upUPS power supply for computer laptopProduct parameters:Model :TM520Rated capacity :500VA/300WRated voltage: 220VAAC input rated frequency: 50HzThe range of input voltage is 120~275VA + 5Input frequency range :(45~55) + 0.5HzBattery input conversion time: 4-8msBattery capacity: * 12V/4.5AH*1Battery current long junction charging current: 4AAC output voltage :220VA + 1% (inverter output)The output frequency :46-54hz (when the AC input is normal) 50Hz + 1% (when the AC input is abnormal)Positive wave :THD