... ) External SNMP or USB or dry contactor (optional) External battery bank (optional)Application Data center, Point-of-sale, Router, ... 220/230/240± 2%Frequency(Hz)50/60± 0.2%(battery mode)WaveformPure sine wave THD < 3% (linear load ... UPS (LCD is optional)LCD & LED displayAlarmLow battery, abnormal AC input, UPS failureProtectionLow battery, overload, short-circuit and over temperatureNoise (dB)< ...