Use this controller to adjust the speed of any plug-in fan up to 300 Watts/3 Amps. Plug the fan into the controller and the controller into any power outlet. No need for hardwiring. U.S.A. Accessory Type Fan accessory, Volts 120, Watts 300, Dimensions L x H in. 2 x 3, Dimensions L x W x H in. 2 x 2 x 3.