Features:* new and high quality.*High Power Control: This 4000W electronic voltage regulator offers high power control for a range of electrical appliances, including speed, temperature, and light adjustments.*Surge Protection: Equipped with a dual capacitor design (safety capacitor + metal film capacitor), this SCR Voltage regulator effectively absorbs surges and voltage spikes, protecting the controllable silicon and increasing efficiency.*The circuit has undergone many technical improvements, and each accessory is now fully technologically mature.*Thyristor is mainly used for resistive loads (electric heating wire incandescent lamps, etc.), and most of the single-phase AC motors can also be used, but they are not guaranteed.Specifications:Product name: 4000W AC regulatorSize: 85*55*38mmKnob hole: 6mmHigh power: 4000W(resistive load power limit), long time should reduce the power use.Efficiency: more than 90%Working voltage: AC 220VRegulating voltage: AC 10-220VPackage Included:1 x Volt RegulatorNote:1. The real color of the item may be slightly different from the pictures shown on website caused by many factors such as brightness of your monitor and light brightness.2. Please allow slight manual measurement deviation for the data.