APC On-Line SRV 1000VA RM 230V Easy UPS with Rail Kit (SRV1KRIRK) - Max Configurable Power (Watts): 800 Watts / 1.0kVA, Input frequency: 40 - 70 Hz, Output Frequency (sync to mains): 50/60 Hz +/- 1 Hz Sync to mains, Load Crest Factor: 3 : 1, Bypass: Internal bypass (automatic and manual), Number of Power Cords: x 1, Interface Port(s): DB-9 RS-232, Smart-Slot, USB, Expected Battery Life: 3 - 5 years