Product Name: 5000W AC Voltage Regulator Dimensions: L84.8 x W70 x H40mm, excluding protruding knobs and joints. Maximum : 5000W (resistive instantaneous load limit ), the should be reduced for a long time, it is recommended to within 2200W of resistive load at room temperature (key parameters, please pay attention). Efficiency: more than 90% Adjustment voltage: AC 0-220V (from high to low can be adjusted to 0, from low to high is about 20V) Note you must the load first and then adjust the voltage. The thyristor is mainly used for resistive loads (electric heating wire incandescent lamps, etc.), of the single-phase AC motors can also be used, but they are not guaranteed. For other types of loads, please confirm the buyer yourself. Operating Voltage: AC 220V Maximum : 5000W High Temperature FR-4 PCB Colour:silver Material:Metal Package Contents: 1 x Voltage Regulator Only the above package content, other products are not included. Note: Light and different displays may the color of the item in the a little different from the real thing. The measurement allowed error is +/- 1-3cm.