The Dial-A-Temp is a plug-In style speed control specifically designed for controlling fans or blowers. It operates from 115 VAC 50/60 Hz with a maximum rating of 300 Watts (2.5 amps) @ 25º C/77º F. The Dial-A-Temp contains an On/Off line switch with variable speed control from low to high. No internal wiring, just plug in and use. One year warranty.