UPS850VA/450Watts,AVR, CPU control,SMT PCB, LCD display,USB,4 battery backup &2 surge protection,12/9Ah ... .5 MinutesHalf Load 6.0 MinutesCharge Time12 Hours(90%)LCD Status DisplayNormal,Fault,Battery,Charge,Overload,Load,Battery CapacityAudible ... AlarmBuzzerAC Unusual/Battery Low Voltage/Overload/Short Circuit/PCB Failed,Beep for 60SecondsInterface Port(s)InterfaceRS-232/USBControl ...