Application: The speed regulator can adjust speed, temperature, voltage, and lighting. It is widely used compatible with exhaust fans, tungsten filament light bulbs, electric furnaces, angle grinders, marble machines, and blowers. It cannot be used in electrical appliances with circuits, microwave ovens, induction cookers, rice cookers, water pumps, washing machines, LED energy-saving lamps and other boards and capacitive electronic components. Materials: The variable speed controller is made of plastic insulated and flame-retardant shell, which does not discolor, deform, crack, and is high temperature resistant. The internal parts are made of thickened phosphor bronze, and has a longer service life. Display: The fan speed control switch uses a precision voltage adjustment knob to adjust the voltage. It has high precision and good stability. The control accuracy can reach 1 volt. Through the digital display, you can accurately understand the working voltage of the machine. The LED light makes the real-time voltage numbers clearer. Overload and overvoltage protection: The variable speed fan controller is equipped with an independent switch to control the voltage, with overload and short circuit protection functions. When the instantaneous current exceeds 15 amps, the switch automatically cuts off power to protect the controller. You can also determine the working status of the switch through the indicator light. Product name: Electronic voltage stabilizer Input voltage: AC220V~250V Output voltage: AC0-220V adjustable Maximum power: 4000W load power 2000W Maximum current: 15A load current 9A Product size: 120x65x55mm Plug Type: EU Plug, it applies compatible with Indonesia, Germany, France, Spain, Italy and so on Material: plastic+metal Voltage: 220V-240V Package Contents: 1 x speed controller