APC Back UPS Pro BR 650VA 6 Outlet AVR LCD Interface (BR650MI) - Max Configurable Power (Watts): 390 Watts / 650VA, Input frequency: 50/60 Hz +/- 3 Hz Auto-sensing, Output Frequency (sync to mains): 50/60 Hz +/- 1 Hz Sync to mains, Transfer Time: 10 ms typical : 12 ms maximum, Interface Port(s): USB, Expected Battery Life: 3 - 5 years