... Wide input range High frequency online UPSKey FeaturesTrue on-line double conversion technology with advanced microprocessor ... start of the UPS Site wiring fault warning On-battery power-on function Smart RS232 communication interface Intelligent slot ... , Utility Power, Inverter, Bypass, Overload, FaultAudible AlarmBypass, On battery mode, Battery low, Overload, FaultAcoustic NoiseAt 1 meter ...