... DischargeBeeping sound every 4 seconds after utility power failsBeeping sound every second if battery approaches ... IndicatorsLCDVFD/LCD Indicator StatusInput/Output Voltage,Frequency,Output Power,Battery,Utility,Inverter,Overload,Fault,BypassCommunication PortRs232/ ... USBInterfaceMonitor of Utility Fault,Power Failure,Battery,UPS Statu Indicator etc.Software ...