... ); 2.Double conversion design; 3.UPS monitoring software; 4.AC surge suppressor; Sine wave ups (1K 2K 3K) Key features: ... 80~286VACTransfer time0 ms; less than 4ms from inverter to bypass and vice versaLED indicatorsStatusLoad level/battery ... level, battery , utility power, inverter, bypass, overload, faultAudible alarmBypass, on battery mode, battery ...