OPTI-UPS TS2250B 2000VA 1200W Line Interactive UPS Battery Backup with AVR Surge Protection - 5 Outlets (Black) - Uninterruptible Power Supply 2000VA / 1200W UPS Battery backup system, 50 / 60 Hz frequency auto sensing and selection 3 Year Limited warranty / live US support Line interactive  corrects voltage without using battery power Short circuit and overload protection to prevent data loss Tel / Modem / LAN surge protection, free OPTI-SAFE Sentinel software History record of power failure events, smart power management software Scheduled shutdown & reboot, extended battery run time  2 internal batteries, uninterruptible power supply (UPS) Energy saving function (UPS green mode), cold start function (DC power on), boost and buck AVR (Auto Voltage Regulation), simulated sinewave design