A new type of bi-directional high-current thyristor is used, capable of handling up to 25 A, which helps prevent over-current issues caused by low resistance in heating element wires during cold start conditions. The product allows easy adjustment of output voltage between 50 and 220 volts, suitable for electrical equipment with varying voltage requirements. The thyristor is primarily designed for resistive loads such as incandescent lamps. Most single-phase AC motors may also be used, though compatibility is not guaranteed. This product can be used to control various electrical devices including lamps, fans, and motors. Maximum resistive load capacity is 2000 W; however, prolonged use at maximum load is not recommended. It is advised to keep the resistive load under 1000 W at room temperature (key parameter, please note). Specifications: Voltage: 220 V Power: 2000 W (maximum resistive load) Voltage adjustment range: 50220 V AC Board: High-temperature resistant FR-4 circuit board Color: As shown in picture Material: Composite material Size: 48 mm x 60 mm x 28 mm Package Contents: 2 x Controller Note: Other items not included. Lighting and display differences may cause slight color variations between the image and actual item. Measurement error allowed is +/- 13 cm.