Features: Fuse Protected. UL listed 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. Built-in a metal clamp at the back of the speed controller. Built-in grounded control outlet. 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 to control speed for high velocity inline fan and mini blower. Make your fan quieter when adjusting to low or medium speed. Safe and environmental friendly. Specifications: Voltage AC120V,60Hz 15A Max. Power 1800W Fuse 15A Dimension 5-1/2"L x 2-2/5"W x 2-2/5" H Power Cord 31-1/2" Package Contents: High-quality Speed Controller Manual