<br> This is a easy-to use voltage regulator for controlling light brightness, speed or temperature.<br> The big power voltage regulator is equipped with two-way silicon controlled rectifier, which is very convenient and practical.<br> The voltage regulator has a large power and can be used for large household or small industrial electrical appliances of which power is less than 4000W(for resistive loads only, power should be reduced for inductive or capacitive loads).<br> Specifications:<br> Input Voltage: AC110V to 220V.<br> Max Power: 4000W(resistive load).<br> Output Voltage: Variable from 0V to input voltage.<br> Size: 85 x 60 x 45mm / 3.34 x 2.36 x 1.77in.<br> Package Includes:1 x Voltage Regulator.<br> Note:<br> The maximum output voltage is equal to input voltage, e.g. if input 110V AC, the maximum output voltage is 110V AC; if input 220V AC, the maximum output voltage is 220V AC.