UPS850VA/450Watts,AVR, CPU control,SMT PCB, LCD display,USB,4 battery backup &2 surge protection,12/9Ah ... (Sine Wave)Output Frequency(Battery Mode)50/60HzOverload Capacity110-120%(60 Seconds)Wave FormStep WavePower Factor0.6Efficiency90%Transfer Time10msBatteries& ... .5 MinutesHalf Load 6.0 MinutesCharge Time12 Hours(90%)LCD Status DisplayNormal,Fault,Battery,Charge,Overload,Load,Battery CapacityAudible ...