1)ups system 2)Big blue screen display. 3)Wide input range and DC start 4)19 inch line ... pure sine wave with synchronous phase-lock loop, LI series can make the protection of over voltage,overload over temperature speedy and ... /output voltage/frequency,load battery voltage, inner temperature, and Inverter statusAlarm:Mains Failure, low battery, overload, UPS faultMute:ManualCrest ratio:3:1Protection ...