Capacity 2000va / 1200w voltage (input) 110/120 vac or 220/230/240 vac voltage range (input) 81-145 vac or 162-290 vac output ac voltage regulation ±10% frequency range 50hz or 60hz ± 1 hz transfer time typical 2-6 ms, 10 ms max. waveform (batt. mode) simulated sine wave battery battery type & number 12 v/9 ah x 2 typical recharge time 4-6 hours recover to 90% capacity alarm battery mode sounding every 10 seconds low battery sounding every second overload sounding every 0.5 second fault continuously sounding