Features: 1. 100% brand new and high quality 2. Made of high quality material, durable and long service life. 3. It is 0 lag and 0 delay with stable performance 4. It has anti-surge, anti-spike, RC absorption multiple protecting function. 5. Used in household appliances, industrial appliances, scientific test equipment, factories, school electrical equipment, etc. Specification: Condition: 100% Brand New Input Voltage: AC220V Output Voltage: 0~220V adjustable (output voltage is less than input voltage) Maximum Power: 4000W (when inputting 220V) Voltage Regulation Range: 0~220V infinitely adjustable (with load) Rated Current: 9A Maximum Current: 18A SCR Model: STMicroelectronics; Thyristor BTA41-600B/800B Package List: 1 * Thyristor Electronic Voltage Regulator Note: 1. When the load is idling, the output voltage is the same as the input voltage. It must be connected to a load of 10W or more to measure the output voltage. 2. Input AC power, the output is also AC, not DC 3. The above mentioned 4000W refers to the power when working under resistive load, and the inductive load is 1/3 of the resistive load. The resistive load refers to the electric lamp, the heating wire, etc; the inductive load refers to the series excitation motor; Do not use electronic smart products with caution 4. Metal enclosure electrical appliances, please safety grounding