Usage Tips: 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 is made of high-quality plastic that is insulated and flame-retardant, resistant to discoloration, deformation, cracking, and high temperatures. Internal components are constructed from thickened phosphor bronze for reliable performance and extended service life. High-precision display: The fan speed control switch features a precision voltage adjustment knob with high accuracy and stable performance. Control precision reaches 1 volt. The digital display allows clear monitoring of the machine's operating 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 instantaneous current exceeds 15 amps, the switch automatically cuts off power to protect the unit. The indicator light shows the switchs working status. Product name: Electronic voltage stabilizer Input voltage: AC 220V250V Output voltage: AC 0220V (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, and other applicable regions Color: As shown Material: Plastic + metal Voltage: 220V240V Package Contents: 1 x Speed controller Note: Light reflection and differences in display screens may cause slight variations between the color shown in the image and the actual product. Measurement error allowance: 13 cm.