Uninterruptable Power Supply(UPS) Product:High Frequency On Line UPS(1kVA~3kVA) Rated ... ±1%)Frequency46~54Hz or 50Hz±0.1Hz(Line mode)50Hz±0.1Hz(Battery mode)(or 60Hz±0.1Hz)Wave formSine WaveDistortion3%4 ... , Battery, Utility power,Inverter,Bypass,Overload,FaultAudible alarmBypass, On battery mode,Battery low ,Overload,FaultAcoustic NoiseAt 1meter distance45 dB50 dB45 dB50 ...