... UPS850VA/450Watts,AVR, CPU control,SMT PCB, LCD display,USB,4 battery backup &2 surge ... 90%)LCD Status DisplayNormal,Fault,Battery,Charge,Overload,Load,Battery CapacityAudible AlarmBuzzerAC Unusual/Battery Low Voltage/Overload/Short Circuit/ ... Surge,SpikeOverload Protection120%-150%Battery Low Voltage Protection10VOutput Short Circuit ProtectionOutput auto cut off,Buzzer beepingEMI FilterYesTel/Fax/ ...