Martin Jerry'S 3 Way Smart Dimmer Switch | Touch Trailing Edge 4 Way Smart 3-Way 4-Way WiFi Switch Dimmer: Works with traditional 3-way and 4-way switches. Two WiFi dimmer cannot work in the same circuit. In both 3-way / 4-way circuit, just replace the live side 3-way standard switch by this wifi swtich. Lights should be Dimmable LED Bulb (150W) LED Dimmer switch: This smart switch implements the Trailing Edge dimmer solution. It is better than other dimmer switches for LED lights. It will bring you a new dimmer experience with larger dimming range, smoother dimming process, and less flickering Dim Schedule: dim your lights in a period. Say from 6am to 8am, change the brightness from 1% to 80%. This can be one time or repeat schedule Installation Notice: In both 3-way or 4-way ciruit, replace the live side traditional 3-way dimmer switch by this one. And keep the other switches as usual.Follow the user manual on website. Neutral Line is required, support 3-way and 4-way Circuit , 2.4G Wi-Fi ONLY (Not 5G). Please contact us for any tech problems Other features include: TASMOTA supported(user manual on our official website), Changeable night light, Adjustable minimum brightness, separate WiFi button Warranty: Martin Jerry Promises 90-Day 100% refund, 1-year Quality Warranty for it?s Smart Home Devices on Amazon