SMAKN&reg; DC 12V 42A 500W Voltage Transformer Switch Power Supply for LED Strip,CCTV, Radio, Computer Project Switch Power Supply,Convert AC 110V/220V to DC 12V . Dual input Voltage: AC 110V/220V. There is a Switch,Choose the Proper Voltage Before use. Steady and Precise Output Voltage,Cooling by Free Air Convection. Shortage Protection,Overload Protection,Over Voltage Protection. Fits for Most Devices with DC 12V.