This voltage regulator is a specially improved circuit for motor speed regulation. The minimum output voltage can be adjusted by a precision multi-turn potentiometer. The voltage regulator has a peak voltage absorption circuit to effectively protect the high-power thyristor, which has a longer life and is more durable. Parameter: Use voltage: AC 220V Maximum power: 2000W Voltage regulation: AC 50-220V Specification size: high temperature resistant FR-4 circuit board circuit board about 36MM*48MM External size: 48MM*60MM (knob direction)*28MM (high) Thyristor withstand voltage up to 1200V/current 25A 1.6mm thick epoxy copper clad laminate Instructions: Connect this product to the circuit of the table lamp or the electrical appliance in series (ie disconnect any one of the live or neutral wires of the table lamp, the electrical appliance, etc., and connect the two wires of this "product") rotary potentiometer The rotary rod can play the role of light and dark adjustment, speed adjustment, pressure adjustment and temperature adjustment; it is very convenient to use. Features: 100% brand new and high quality The input is connected with AC 220V, output is connected to the electric stove wire or motor appliances, then rotate the knob for speed, voltage, temperature control. Specifications: Working Voltage: AC 220V Maximum Power: 4000W (connected resistive load) Voltage Regulation:AC 0-220V,Start from AC 10V Dimensions: 85(L) x 58(W) x37.5(H)MM/3.35x2.56x1.5" Protection: Anti-spike, Surge, RC absorption (EOC) Using Method: Step 1: Adjustable Power Supply Board; Step 2: connect this device with lamp or home appliance or electric circuit; Step 3: then rotate the knob for dimming, speed, voltage, temperature control. Application: Electric furnace, water heater, lamps, small motor, electric iron etc. Type: Governor/Regulator/Motor speed controller/Dimmer Module Attention: Load does not exceed the maximum power, otherwise it will burn module and electrical appliances; Use the resistive load as far as possible; Reduce inductive and capacitive load power greatly. ( it is best to leave more than half of them)