[High Usability]:This variable speed controller is perfect for controlling the speed, heat, light, and power of various tools like hand drills, electric saws, tungsten lamps, heaters, and motor fans, etc. It can be used in factories, labs, homes, and other locations. [Safe Design]:This AC motor speed controller features a 15A overload protection switch, providing 24/7 real-time automatic monitoring to prevent potential risks arising from overload or short-circuit situations. [High temperature-resistant metal shell andamp; Heat dissipation vents]:The enclosure is crafted from high temperature-resistant metal shell with rust-resistant metal coating. Heat dissipation vents are strategically placed around the variable speed controller, ensuring it maintain a safe operating temperature even during extended use. NOTE: Proper grounding is essential for the metal shelland#39;s safety. [Easy to operate]:Simply connect the fan speed controller to your tools by plugging in the output plug. You can easily control the speed or pressure data (0-220V) to meet your specific requirements by adjusting the rotary knob as needed. The LED display provides accurate real-time adjustment data. [Technical Parameter] Input voltage:AC110V/220V;Adjustable output voltage :0-220V;Rated current : 9A;Input max current:18A current;The limit power :4000W. Plug Type: US Plug, it applies to Canada, India, Mexico, Thailand, Taiwan, the United States, the Philippines and so on. Voltage: AC 220V Colour:Black Material:plastic Package Contents: 1 x Voltage Regulator