APC BACK-UPS CS 350VA 230V UPS (BK350EI) - Max Configurable Power (Watts): 210 Watts / 350VA, Input frequency: 50/60 Hz +/- 3 Hz Auto-sensing, Output Frequency (sync to mains): 47 - 63 Hz Sync to mains, 50/60 Hz +/- 1 Hz Unsynchronized, Transfer Time: 6 ms typical : 10 ms maximum, Number of Power Cords: x 2, Interface Port(s): Optional Simple Signaling RS232 cable, USB, Expected Battery Life: 4 - 6 years