... UPS manufactures in China. They are widely used in different fields, including electric power, science institute, national defense, telecom, finance, insurance, ... .FLEXIBLE POWER SOLUTION220V,230V,240V; 50Hz,60Hz; 3/3, 3/1, 1/3, 1/1GREAT PERFORMANCE INDEXOverall efficiency ≥ 95%, inverter efficiency ... maintenances of the UPS is very easy, just with the power module changed. pure sine wave online UPS