Connect this device with lamp or home appliance in a series connection, then rotate the knob for dimming, speed, voltage, temperature control. This voltage regulator is used for motor speed regulation and can adjust the output voltage through the precision multi-ring potentiometer. This item has new two-way large power silicon controlled rectifier and the current can be up to 100A, which is a good solution to over-current of electric stove wire caused by low resistance during cooling. Anti-surge, RC absorption multiple protection. AC 0V-220V continuously adjustable, zero lag, zero delay, ultra-high heat dissipation. Specification : Voltage: AC 220V Maximum Power: 8000W (instantaneous limit power for impedance load; for long time use, 4000W or lower is recommended) Voltage Regulation: AC 0-220v Circuit Board: FR-4 circuit board maximum. Current: 100A Size: Approx. 6*3.7*4.5cm/2.4*1.5*1.8inch Weight: Approx. 92g/3.2oz Use method: The voltage regulator can be used in the circuit in series, and the voltage regulator can be connected to the lamp and electric appliance in series (that is, either the lamp or electric appliance can be disconnected from the fire line or null line, which can be connected to the terminal of the "product"). Simple and convenient operation. Package List: 1 x Motor Speed Controller Note: 1. You can't adjust voltage before connecting the load. 2. You need some professional knowledge to use it.