4000VA/2400Watts,AVR, CPU control, LCD display,Management software, Metal housing, CE certified,external battery connection ModelUPS-4000DLPower2400WTechnologyOnlineInputInput ... Time10msBatteries&RuntimeBattery TypeExternal battery,built-in ChargerCharge Time12 Hours(90%)LCD Status DisplayNormal,Fault,Battery,Charge,Overload,Load,Battery LevelAudible AlarmBuzzerAC ...