1Knob switch to control speed with 4 options: Off, Low, Medium, and High 2It will automatically power off when overload due to the built-in circuit breaker 3Ultra-compact and plugs directly into an outlet, no messy wires 4It can be widely used for exhaust fan, high velocity inline fan, mini blower and more 5It's made of high quality material for high safety and long durability Features: Knob switch to control speed with 4 options: Off, Low, Medium, and High. It will automatically power off when overload due to the built-in circuit breaker. Ultra-compact and plugs directly into an outlet, no messy wires. It can be widely used for exhaust fan, high velocity inline fan, mini blower and more. It's made of high quality material for high safety and long durability. With mini size, light weight, and easy to operate. Specifications: Condition: 100% Brand New Color: Black Voltage: 120V/ 60Hz Plug: US Plug Maximum Input Power: 350W Maximum Input Current: 3A Speed Range: 50~10000rpm Package Weight: 125g Quantity: 1pc Package Included: 1 x Fan Speed Controller Note: Please note that the new type and old type of this product will be sent randomly, and make sure you will not mind before ordering.