Solu 4000W 220V SCR Voltage Regulator Motor Speed Controller Dimming Thermostat// High-power 4000W 220V SCR Voltage Regulator Motor Speed Controler for Arduino About us (Solu ), Professional factory of circuit boards for Arduino, welcome to our store for more choices with best price. What we pursue is your satisfication of our service, not just for our goods.For any reason you are unsatisfied with our product at any time, simply contact support for exchange or refund. we will reply you about any question you ask within 24 hours Special design with 1.6 thick FR - 4 high temperature resistant circuit boardit is safety and reliable to cope with large current. Double capacity design: Safety capacitor and Metal film capacitor to protect SCR more effective. More efficiency and more safety.1.5 thick aluminum and stainless steel casemore suitable for family temperature control or speed control and industrial enterprises to use. Usually, you will get it actually in 9~19 days, If you are in the USA and the item is NOT Fulfilled by Amazon. the item will be sent to you by USPS with shipping information from China. The estimated delivery time offered by Amazon is not the real time. Your patience is highly appreciated. Hope you will receive your item soon and enjoy using it. 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.