Docooler&reg; 12V 40A 480W Dimmable LED Driver Switch Power Supply LED Strip Lights Dimming Controller Switch power supply, convert AC 11V/22V to DC 12V . Dual input voltage: AC 11V/22V. There is a switch, choose the proper voltage before use. Steady and precise output voltage. Short circuit protection, overload protection(15%15%), over voltage protection(115%135%). Widely used as the power adapter for Led strip, LED display, billboard, industrial equipment, etc. IN-DOOR USE ONLY!