The 12V DC power supply is intended to be used with the 240 Series LaserMounts when operating the mount from a temperature controller that does not include a built-in power supply for the fan (such as the 5235 TECSource, or any non-Arroyo controller). International customers will receive a kit which includes replacable plugs to match your local power outlet style. It is a switching power supply, and will work on any standard worldwide voltage.