ITEM NAME:4000W 220V AC SCR Motor Speed Controller Module AC Voltage Regulator Dimme IJK Descriptio n Specifications: Product Name: 4000W AC Voltage Regulator Size: 100*40*68mm (L*W*H), Knob Inner Hole 6mm. Maximum Power: 4000W (Resistive Load Limit Power), The Power Should Be Reduced For A Long Time, It Is Recommended To Use Room Temperature Resistive Load Within 2000W. Efficiency: 90% Or More Working Voltage: AC 220V Adjusting Voltage: AC 0-220V (10 Volts Callback Can Be Zero Volts Under Resistive Load) Package Included: 1 * Voltage Regulator Note: The voltage under the load must be turned on first. The product is mainly used for resistive loads (such as electric furnace wire, etc.) We offer you what you need! AC 220V 4000W SCR Electric Voltage Regulator Dimmer Motor Speed Controller Power.Efficiency: 90% Or More. We want to make sure you are happy with our item. Goods without RMA number will NOT be accepted. We'd like to settle any problem in a friendly manner.