1、AC 0V-220V continuously adjustable 2、0 hysteresis, 0 delay, super heat dissipation. 3、With surge protection, anti-spike, RC absorption multiple protection 4、Simple structure and convenient to operate 5、High temperature resistant fireproof FR4 circuit board, durable and long service life. Features: 1. AC 0V-220V continuously adjustable 2. 0 hysteresis, 0 delay, super heat dissipation. 3. With surge protection, anti-spike, RC absorption multiple protection 4. Simple structure and convenient to operate 5. High temperature resistant fireproof FR4 circuit board, durable and long service life.   Specification: Condition: 100% Brand new Item Type: Motor Speed Controller Use Voltage: AC 220V Maximum Power: 4000W, resistive load limit power, use for a long time should reduce power use, it is recommended that the room temperature resistive load is within 2000W. Voltage Regulation: AC 0V-220V continuously adjustable. The set down can go to 0 and the boost starts at around 60V. High temperature resistant fireproof FR4 circuit board Size: Approx. 6 x 4.5 x 4.3cm / 2.4 x 1.8 x 1.7in   Package List: 1 x Motor Speed Controller   Note: It must be connected to load to regulate   Instructions: The voltage regulator is connected in series in the circuit, and the voltage regulator and the desk lamp and the electric appliance are connected in series in the circuit (that is, the lamp or the electric appliance is disconnected from any of the live wire or the neutral wire, and the wiring of the "product" is connected. The terminal can be turned on, and the knob cap can be turned to adjust the light, temperature, pressure.