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 electronic appliances containing circuit boards, capacitive components, microwave ovens, induction cookers, rice cookers, water pumps, washing machines, or LED energy-saving lamps. High-quality materials: The variable speed controller features a high-quality plastic insulated and flame-retardant housing that resists discoloration, deformation, and cracking under 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 control. 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 LED indicator 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 the instantaneous current exceeds 15 amps, the switch automatically cuts off power to protect the unit. The indicator light shows the switch’s working 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 55 mm Plug type: EU Plug (suitable for use in Indonesia, Germany, France, Spain, Italy, etc.) Color: As shown Material: Plastic + metal Voltage: 220V–240V Package Contents: 1 x Speed controller