... 30-75KHZVertical frequency 56-75KHZSurface Treatment Anti-GlareWorking temperature 0~50(Degrees Celsius)Storage temperature -20~60(Degrees Celsius)working humidity ... -mounted, desktopLife No less than 60,000 hoursVoltage AC100V ~ 240V, 50/60HzOn Mode (Average) 45W (Max)Standby Mode <3W CCTV monitors ... ",19",21.5",23.5",26",32",37",42",47",55",65",70")