Usage Tips:Speed controller Speed controller For 4000W motor controller Voltage regulator Description: Working voltage: 220 V alternating current. Maximum power: 4000 W (connected resistive load). Made of metal material. Protection: anti-peak, surge, RC absorption (EOC). Some applications: Electric furnace, water heater, lamps, small motor, iron, etc. It is more suitable for families and inconvenient installations of factories and businesses. The input is connected to 220V AC, the output is connected to the cable of the electric cooker or motor appliances, then turn the knob for speed, voltage and temperature control. Specifications: Material: metal, electronic parts. Colour: as pictures show. Size: 85 x 55 x 38 mm. Notes: Due to the different light and screen settings, the colour of the item may differ slightly from the pictures. Please allow slight dimensional differences due to different manual measurements. Package Include: 1 * 4000W 220V AC SCR module.