UPS 3 phase Low Frequency online,LED/LCD display General (UPS-HB power ... series runs in online sine wave made with isolating output transformer, input under - voltage, over - voltage protection , output under-voltage,over ... usedup, it will sound continuously.lnterface to computer9-pin D type connector (Optional part)EnvironmentTemperature: 0~40 , relative humidity: 95%(no ...