... self-check, battery check by itself·Online static bypass, strong protection for overload and ups fault·RS232 & SNMP for optional, to ... Bypass Output AutomaticlyDisplayLCDChinese / English MenuInput Voltage,Output Voltage,Current,Frequency,Battery Voltage & Charging Current,Fault,AlarmLEDUPS StatusAlarmBattery Low VoltageAlarm ... over 27 years.Product picture: LCD panel 6-20K high frequency Online UPS