APC Smart-UPS SC SC420 420VA 120V UPS System The item is non-returnable Output Power Capacity: 260 Watts/420 VA Nominal Output Voltage: 120V Output Frequency (sync to mains): 47~53 Hz for 50 Hz nominal, 57~63 Hz for 60 Hz nominal Waveform Type: Stepped approximation to a sinewave; Typical recharge time: 5 hours