Features: The variable speed Controllers, is equipped with multiple protections measure including surges protections, spikes protections. The fan speed Controllers, is equipped with independent switches for voltaged control, featuring overloads and short circuits protections. High precisions LED Voltages display provide real time output Voltages for easy adjustments. Precisions Voltages Adjustment Knob Voltages adjustment utilizes a precise potentiometer, offering high accuracy and excellent stability. Can adjust temperature, speed, light, and Voltages setting, suitable for electric fan, exhaust fan, drills, angle grinders, blowers, electric drills, LED light, and more. Not suitable for appliances with circuit boards and capacitors electronic component, such as microwave, induction cookers, rice cookers, water pumps, washing machines, LED energies saving lamp, and similar devices. Specifications: Materials: Plastic Plugs: EU/US(Optional) Size: about 12x6.5x5.50cm/4.72x2.56x2.16inch US Plugs Input Voltage: 110V/220V EU Plugs Input Voltage: 220V Current Capacity: 15A Maximums Rate Current: 10Amp Frequency: 60Hz Resistive Load: Maximums 2000W Inductive Load: Maximums 1000W Note: Please allow 1-2cm errors due to manual measurement, make sure that you do not mind before you order. Due to difference between different monitors, the picture may not reflect the actual color. Package includes: 1pc Motor Speed Controllers