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 devices containing electronic circuit boards, microwave ovens, induction cookers, rice cookers, water pumps, washing machines, LED lamps, or other 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 safety, reliability, and extended service life. High-precision display: The fan speed control switch uses a precision voltage adjustment knob. It offers high accuracy and stable performance, with control precision up to 1 volt. A digital display shows real-time output voltage clearly, enhanced by an LED backlight. Overload and overvoltage protection: The variable speed controller includes an independent power switch with overload and short-circuit protection. If instantaneous current exceeds 15 A, the unit automatically cuts off power to protect itself. An indicator light shows operational status. Product name: Electronic Voltage Regulator Input voltage: AC 220–250 V Output voltage: AC 0–220 V (adjustable) Maximum power rating: 4000 W (recommended load: 2000 W) Maximum current rating: 15 A (recommended load: 9 A) Product dimensions: 120 × 65 × 55 mm Plug type: EU plug (compatible with Indonesia, Germany, France, Spain, Italy, etc.) Color: As shown Material: Plastic + metal Rated voltage: 220–240 V Package contents: 1 × speed controller Note: Color may vary slightly due to lighting and screen settings. Measurement tolerance: ±1–3 cm.