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 with appliances containing circuit boards, microwave ovens, induction cookers, rice cookers, water pumps, washing machines, LED or energy-saving lamps, or other capacitive electronic components. High-quality materials: The variable speed controller features a high-quality plastic insulated and flame-retardant shell that resists discoloration, deformation, cracking, and high temperatures. Internal components are made of thickened phosphor bronze for reliable performance and extended service life. High-precision display: The fan speed control switch includes a precision voltage adjustment knob with high accuracy and stable performance. Control precision reaches 1 volt. Digital display allows clear monitoring of the machine's working voltage. LED indicator enhances visibility of real-time voltage readings. Overload and overvoltage protection: The variable speed fan controller has an independent switch with overload and short circuit protection. When instantaneous current exceeds 15 amps, the switch automatically cuts off power to protect the unit. An indicator light shows the operational status. 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 size: 120 x 65 x 55mm Plug Type: EU Plug, suitable for use in Indonesia, Germany, France, Spain, Italy, and similar regions Color: As shown Material: Plastic + metal Voltage: 220V–240V Package Contents: 1 x Speed controller Note: Only the items listed above are included. Light reflection and display differences may cause slight variations between the product color in images and actual color. Measurement may vary by ±1–3cm.