Wide application: The speed regulator can adjust speed, temperature, voltage, and lighting. It is widely used in exhaust fans, tungsten filament light bulbs, electric furnaces, angle grinders, marble machines, and blowers. Note: It cannot be used in electrical appliances with circuits such as microwave ovens, induction cookers, rice cookers, water pumps, washing machines, LED energy-saving lamps, and other devices containing capacitive electronic components or circuit boards. High-quality materials: The variable speed controller is made of high-quality plastic insulated and flame-retardant shell, which does not discolor, deform, or crack under high temperature. The internal components are made of thickened phosphor bronze, ensuring safe, reliable performance and extended service life. High-precision display: The fan speed control switch features a precision voltage adjustment knob to regulate voltage with high accuracy and stability. Control precision can reach 1 volt. The digital display allows clear monitoring of the machine's working voltage, and the LED light enhances visibility of real-time voltage readings. Overload and overvoltage protection: The variable speed fan controller includes an independent switch for voltage control, equipped with overload and short circuit protection. When the instantaneous current exceeds 15 amps, the switch automatically cuts off power to protect the unit. An indicator light shows the operational status of the switch. Product name: Electronic voltage stabilizer Input voltage: AC 220V–250V Output voltage: AC 0–220V (adjustable) Maximum power: 4000W (load power 2000W) Maximum current: 15A (load current 9A) Product dimensions: 120 x 65 x 55mm Plug type: EU Plug, compatible with countries including Germany, France, Spain, Italy, and Indonesia Color: As shown Material: Plastic and metal Voltage: 220V–240V Package contents: 1 x Speed controller