... Up to 90%AudibleAlarmBattery DischargeBeeping sound every 4 seconds after utility power failsBeeping sound every second if battery approaches final dischargeOverload ProtectionContinuous ... Indicator StatusInput/Output Voltage,Frequency,Output Power,Battery,Utility,Inverter,Overload,Fault,BypassCommunication PortRs232/USBInterfaceMonitor of Utility Fault,Power Failure,Battery,UPS Statu Indicator ...