features: Input voltage: AC (AC) 100V-240V 50-60HZ Output voltage: DC (direct current) 4000MA Rated output current: 4000MA Protection function: overload protection 105%~150% of the rated power Automatic recovery of overvoltage protection 115%~135% of the nominal voltage. Insulation strength: input-output AC 2000V/10 seconds Insulation resistance: input-output>50MQ, DC 500V Environment: operating temperature 0~45°C, 20%~90%RH Storage temperature -20°C~85°C 10%~95%RH