The item is non-returnable</br>Output Power Capacity: 280 Watts / 450 VA</br>Max Configurable Power: 280 Watts / 450 VA;    Nominal Output Voltage: 120V</br>Output Voltage Distortion: Less than 5% at full load</br>Output Frequency (sync to mains): 47 ~ 53 Hz for 50 Hz nominal?? 57 ~ 63 Hz for 60 Hz nominal</br></br>Product Description</br></br>APC Smart-UPS SC SC450RM1U 280W/450VA 120V 1U Rackmount UPS System</br>