Variable Speed Controller Fan, Control for Electric Motor Rheostat AC 120V Power from 500w to 1800w Adjuster Three settings include off, on (full) and variable. Simple use the dial to increase or decrease fan motor speed. Features: - Fuse Protected - UL listed power cord and plug for safe use - One control switch for 3 settings: Variable Speed, OFF and Full Speed - Speed control dial to control variable speed: Low, Medium or High speed - Applicable for fan or router which power is from 500W to 1800W - With built-in grounded control outlet and metal clamp at the back - Come with 31 1/2 grounded power cord with US standard plug - Especially convenient for you when the power cord of your fan is not very long - Lightweight, practical and easy to use - Perfect for controlling speed of high velocity inline fan and mini blower - Make your fan quieter when adjusting to low or medium speed - Safe and Note: Use with centrifugal fans only Will not work with brushless type motor or soft/slow start motors. Router sold separately. Package Including: - 1x Fan Speed Controller