... voltage regulations), USB communication port, alarms for battery backup, low battery and overload, energy saving function (UPS green ... 220VAC ±1%Frequency 50Hz ±0.1% (Battery Mode)Waveform Sine Wave form Power Factor 0. ... dischargeTransfer Time0 ms Maintenance Bypass SwitchYesLED IndicatorsStatus Load level /Battery level,Battery,Utility Power,Inverter,Bypass,Overload,Fault.Audible ...