APC BK350 350VA UPS System Output power capacity: 350VA / 210W Typical backup time at full load: 4.7MIN (210W) Typical backup time at half load: 18.1MIN (105W) Interface port: USB &amp; Serial Port Outlets: 3 UPS, 3 SURGE Nominal Output Voltage: 120V Waveform Type: Stepped approximation to a sinewave