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 circuits, including microwave ovens, induction cookers, rice cookers, water pumps, washing machines, LED lamps, and other capacitive or board-based electronic equipment. Material: The variable speed controller features a plastic insulated, flame-retardant housing that resists discoloration, deformation, and cracking under high temperatures. Internal components are made of thickened phosphor bronze for enhanced 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 LED display shows real-time output voltage clearly. Overload and overvoltage protection: The controller includes an independent power switch with built-in overload and short-circuit protection. Power is automatically cut off when instantaneous current exceeds 15A, safeguarding the unit. An indicator light shows operational status. Product name: Electronic Voltage Regulator Input voltage: AC 220V–250V Output voltage: AC 0–220V (adjustable) Maximum power rating: 4000W (recommended load: 2000W) Maximum current rating: 15A (recommended load: 9A) 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