A new type of bi-directional high-power thyristor is used, because the current can 25 A, which solves the problem of over-current caused by too small resistance of the electric furnace wire in the case of cooling. The product can easily adjust the output voltage, between 50 and 220 volts, for the use of electrical equipment with different voltage requirements. Thyristor is mainly used for resistive load (electric filament incandescent lamp, etc.). Most single-phase AC motors are also available (but not guaranteed). The product is suitable for controlling different electrical equipment, such as electric lamps, fans, motors, etc. The ultimate resistance load power of the product is 2000 W. It should be reduced for a long time. It is suggested that the resistance load should be less than 1000W at room temperature (key parameters, please note). Specification: Voltage: 220V power: 2000W (Resistive load ultimate power) Voltage adjustment: 50-220V AC Board: High Temperature Resistant FR-4 Circuit Board Colour:As shown Material:Composite material Size:48MMx60MMx28MM Package Contents: 2 x Controller Only the above package content, other products are not included. Note: Light shooting and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm. Product Notes: Please allow a little manual errors.Due to the lighting of the photos and the difference of monitors, the pictures may not reflect the actual color of the real item. Please confirm acceptance before ordering. About Shipping: Please ensure your shipping informations are correct to avoid delivery issues. All orders are shipped within 3 days after payment. Delivery usually takes 8–12 days, The specific delivery time is depend on circumstances. If you have any questions during your purchase, feel free to contact us. We will respond you within 24 hours.