... (auto voltage regulations), USB communication port, alarms for battery backup, low battery and overload, energy saving function (UPS green mode ... ms Maintenance Bypass SwitchYesLED IndicatorsStatus Load level /Battery level,Battery,Utility Power,Inverter,Bypass,Overload,Fault.Audible ... 4 second, every second if battery low.Overload Alarm beeps two for every second.FaultAlarm beeps continuously.Acoustic ...