Max Configurable Power (Watts): 450 Watts / 800VA Output Frequency (sync to mains): 50/60 Hz +/- 1 Hz Unsynchronised Input frequency: 50/60 Hz +/- 5 Hz Auto-sensing Battery type: Lead-acid battery Expected Battery Life (years): 3 – 5 Control panel: LED Status display with on line : on battery Audible Alarm: Alarm when on battery : distinctive low battery alarm : overload continuous tone alarm