Wide Application: The speed regulator adjusts speed, temperature, voltage, and lighting. It is suitable for exhaust fans, tungsten filament light bulbs, electric furnaces, angle grinders, marble machines, and blowers. Note: Not compatible with devices containing electronic circuitry, such as microwave ovens, induction cookers, rice cookers, water pumps, washing machines, LED lamps, or other capacitive or board-based 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 enhanced safety, reliability, and extended service life. High-Precision Display: This fan speed control switch uses a precision voltage adjustment knob for accurate voltage regulation. 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 built-in overload and short-circuit protection. If instantaneous current exceeds 15A, the unit automatically cuts off power to protect itself. An indicator light shows the operational status. Product Name: Electronic Voltage Regulator Input Voltage: AC 220V–250V Output Voltage: AC 0–220V (adjustable) Maximum Power: 4000W (recommended load: 2000W) Maximum Current: 15A (recommended load: 9A) 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: 220V–240V Package Contents: 1 × Speed Controller