... Voltage. Output Voltage.ProtectionShort Circuit, lightning, over voltage, unbalanced loadsCool systemfanAudible Noise (at ... InterfaceRS232(Optional)EnvironmentOperating Temperature-5~40°COperating Humidity10~90%, non condensingWeightNet ... *475 descriptionApplicationHome/Office used, SOHO, Smalll scale exchange, Workstation, Peripheral device, Fan, TV ... control standard backup UPS 500va 300w