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 electrical appliances containing circuits such as microwave ovens, induction cookers, rice cookers, water pumps, washing machines, LED energy-saving lamps, or devices with capacitive electronic components. High-quality materials: The variable speed controller features a high-quality plastic insulated and flame-retardant housing 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 for accurate voltage regulation. It offers high precision and stable performance with control accuracy up to 1 volt. The digital display allows clear monitoring of the machine's working voltage. The built-in LED light enhances visibility of real-time voltage readings. Overload and overvoltage protection: The variable speed fan controller includes 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 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 size: 120 x 65 x 55mm Plug Type: EU Plug, suitable for use in Indonesia, Germany, France, Spain, Italy, and other compatible regions Color: As shown Material: Plastic + metal Voltage: 220V–240V Package Contents: 1 x Speed controller Note: Other items not included. Lighting and display differences may cause slight variations in color appearance. Measurement error allowance: ±1–3cm.