NCTS (NCTS-QSTROM) Qstrom Pro Line Interactive UPS 3kVA 1.8kW, AVR, LCD with Alarm - Black 3000VA 1800W 4x 12V 9A Batteries, Fast Recharge, Off-Mode Charging, 6-8h Charging Time to attain 90% Capacity Boost & Buck AVR Microprocessor Control Simulated Sinewave Output LCD Display for AC Mode, Battery Mode, Load Level, Battery Level, Input/Output Voltage, and Status Alerts Full Protection for Short Circuit, Overload, Overcharge, and Overdischarge Protection for Safety and Longevity Alarm with Various Frequencies Generator Compatibility for Personal Computers 2 Years Warranty Period (1 Year Warranty for Batteries)