APC Smart-UPS SC620 4-Outlet 620VA 390W UPS System Output Power Capacity: 390 Watts/620 VA Nominal Output Voltage: 120V Output Frequency (sync to mains): 47~53Hz for 50Hz nominal, 57~63Hz for 60Hz nominal Waveform Type: Stepped approximation to a sinewave Typical recharge time: 5 hours