Martin Jerry 3 Way Smart Switch, Alexa Voice Control, Google, Way Light Switch. Installation Notice: It must install at the live power side (Not load side), Neutral wire is required at the outlet box, 2.4G Wi-Fi ONLY (Not Support 5G), NOT Dimmer Switch. For any tech queries, we will support you promptly. 3 Way: It works with your exisitng 3way 4-way toggle switch and rocker switch in the same ciruit. Only replace one of them by this Wi-Fi switch Specifications: 100-240V, 15A(Max), 50/60Hz, 1-Pack Smart Switch Other Functions: smart switch Alexa and Google Home for Voice Control (Smart Life Skill). Free App (Smart Life App) for both iOS and Android, Schedule, Timing, Sharing, IFTTT DIY to form an interesting smart home automation system Warranty: Martin Jerry Promises 90-Day 100% refund, 1-year Quality Warranty for it?s Smart Home Devices on Amazon, like WiFi Smart Plug, Plugs, Smart Switch, Wall Switches, Smart Bulb, Homekit smart plug