Description: Multifunction: This voltage regulator can help to control the voltage, motor speed, thermostat temperature, light brightness. Wide application: This 4000W voltage regulator can be used on a household appliances, industrial appliances, and so on. Easy to use: This voltage controller features a stepless adjustment, and the voltage regulation range is 0 to 220V. No delay: This voltage regulator is designed with precise resistance and high voltage capacitance, providing stable output. Reliable: This high power voltage regulator is designed with overload for protection, surge for protection, etc. So the device is safe to use. Specification: Maximum power: 4000W(Adapt to 2000W-3000W resistive load). Regulating range: 0-220V. Rated current: 9A. for Limited current: 18A. Load for protection switch: Yes. Output power indicator: Yes. Material: Metal. Color: Show as picture. Size(LxWxH): Approx. 15x11x11cm/5.91x4.33x4.33 inch. Note: There might be a bit of color distortions due to different computer resolutions. There might be a slight error due to different hand measurements. Under empty load, the output voltage that is tested is virtual voltage. Must have 20W and above load. The input is AC, then the output is AC. Metal housing must be connected to the ground. Package Includes: 1 Piece Voltage Regulator.