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, and cracking under 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 to regulate output voltage. 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 variable speed controller includes an independent power switch with built-in overload and short-circuit protection. Automatic power cutoff activates when instantaneous current exceeds 15A to protect the unit. An indicator light shows operational status. Product name: Electronic Voltage Controller Input voltage: AC 220V–250V Output voltage: AC 0–220V (adjustable) Maximum power rating: 4000W (recommended load: 2000W) Maximum current rating: 15A (recommended load current: 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