1,low frequency online ups 2,IGBT technology 3.,OEM is accepted and Factory price ... 110%Wave crest factorBetter than 3 : 1Waveformsine waveEfficiencyAC TO AC95%LCD displayDisplay Infostatus display, voltage input/output, frequency, loading,working temperature ... °CRelative Humidity10%-90% non-condensingWorking HeightBelow 5000 feet Low-Frequency online UPS 3KVA