... function Smart RS232 communication interface Intelligent slot available Sealed lead-acid, maintenance free battery Technical SpecificationsProduct SeriesCASTLEModelBS1KBS2KBS3KRated PowerVA/W1kVA / 0.7kW2kVA / ... vice versaLED IndicatorsStatusLoad level / Battery level, Battery , Utility Power, Inverter, Bypass, Overload, FaultAudible AlarmBypass, On battery mode, Battery low, Overload, FaultAcoustic ...