APC 5000VA 230V Rackmount/Tower Smart-UPS (SUA5000RMI5U) - Max Configurable Power (Watts): 4.0kWatts / 5.0kVA, Input frequency: 50/60 Hz +/- 3 Hz Auto-sensing, Output Frequency (sync to mains): 47 - 53 Hz For 50 Hz nominal Sync to mains, Efficiency at Full Load: 96.0 %, Load Crest Factor: 3 : 1, Transfer Time: 2 ms typical : 4 ms maximum, Interface Port(s): DB-9 RS-232, SmartSlot, Expected Battery Life: 3 - 5 years