High frequency online UPS Double conversion and IGBT technology Advanced battery management High frequency online UPSKey FeaturesTrue on-line double conversion technology with advanced microprocessor ... Power, Inverter, Bypass, Overload, FaultAudible AlarmBypass, On battery mode, Battery low, Overload, FaultAcoustic NoiseAt 1 meter distance45 dBA50 dBACommunicationsDB-9 PortRS ...