Features: This voltage regulator is used for motor speed regulation and can adjust the output voltage through the accuracy multi‑ring potentiometer Connect this device with lamp or home appliance in a series connection, then rotate the knob for dimming, speed, voltage, temperature control This controller is adopt of high‑quality SCR, resistance to high temperature and high voltage, and the maximum current is up to 25A Multifunctional:This AC-Voltage regulator can be used to control AC-motor speed, AC-light and heating wire temperature Wide Use: Could be widely used as heat controller on electric stove, water heaters, light dimmer on lamp, speed controller on small motors, or temperature controller on electric soldering iron, etc Notice: 1.Actual color may be slightly different from the image due to different light effect 2.Please allow 1-3cm deviation due to manual measurement Desc Use voltage: AC-220V Maximum power: 2000W Voltage regulation: AC-50-220V Specification size: high temperature FR-4 circuit board circuit board 36MM * 48MM or so Outer size: 48MM*60MM (knob direction) *28MM (height) How to Use This product is connected in series in the lamp or electrical appliances in the circuit, (that is, the lamp, electrical appliances, etc., disconnect any one of the firewire or zero-wire, the “product” of the two wires can be connected) rotate the potentiometer-lever, you can play the role of adjusting the brightness and darkness, speed, voltage, temperature; very convenient to use. Package List: 1x AC-Motor Speed Control Controller