3-Way WiFi Switch Dimmer: Both Master & Add-on Switches are dimmable. Support INC bulb (400W), Dimmable LED (150W) and CFL bulb (150W). The add-on switch CAN NOT work independently. It must work with our master switch. The master switch CAN NOT work with other standard 3 way switches Home Automation System: Compatible with Alexa and Google Home Voice Control (Smart Life Skill), Remote Control via Smart Life App on iOS and Android. No Hub is required for Wi-Fi Dimmer Switch Installation: Follow the user manual on website. Live and neutral wires are required for the master switch, 2.4G Wi-Fi ONLY (Not 5G Wi-Fi), Adjust the lowest brightness on the Master switch. This is 3-way kit (two switches control same lights), For 4-way, please puchase one more add-on switch in our store. Advantage: Lowest brightness calibration, Over Temperature Protection, Wiring Error Alarm & Protection, Brightness Memory, Soft On & Soft Off Lighting for Comfortable Visual Effect, Responsiveness Physical Button Warranty: we offer 90-Day 100% refund, 1-year Quality Warranty. Promptly tech support online. Send us wiring photos if it cannot work after installation smart dimmer switch 3 way