Double Conversion on-line Design with Power Factor Correction (PFC) of up to 0.99. UPS Capacity 2000 VA / 1800 W, Input Voltage Range 176 VAC to 264 VAC @ 100% Load, Input Frequency 50/60 Hz, Output Voltage Range 208/220/230/240 VAC, Output Frequency 50/60 Hz ± 0.1 Hz (Bat. Mode), 4× 12 V / 9 Ah Lead-Acid Batteries, 48 VDC System Voltage, 8 IEC Outlets, USB Port, RS-232 Port, Intelligent Slot, LCD Screen, Surge Protection, Overload Protection, Discharge Protection, Short Circuit Protection, Operating Temperature 0°C to 40°C, Dimension 440 × 460 × 86.5 mm, Weight 19.5 kg. Optional external Battery Pack: DS-UPSB0948B-R/TJC.