APC Smart-UPS 750VA 600W 120V Rack/Tower LCD Battery Backup Power Supply (SMX750) High-Efficiency Green Mode Sine Wave Output Extendable Runtime Rack/Tower Convertible Non-returnable item Output Power Capacity: 600 Watts/750 VA Nominal Output Voltage: 120 V Output Frequency (sync to mains): 47 ~ 63Hz Waveform Type: Stepped approximation to a sinewave Typical recharge time: 3 hours