Provide boost and buck AVR to stabilize input voltage
. Provide lightning, surge overload, and short-circuit protection. Built-in CCCV battery charger and battery over drain protection. No load auto shutdown (Dip switch setup). Auto restart when AC recovery. Buzzer alarm auto-reset (Dip switch setup). Cold start function (DC power on) . Tel / Modem / Fax / Internet surge suppression. Optional Bundle software: Automatically save your valuable files before auto shutdown. 1000VA 600W LCD panel 2 x HR1221 Batteries