Martin Jerry'S 3 Way Smart Switch Features Voice Control, Way Light Switches. Product Details 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 Payment We accept PayPal and credit cards via PayPal. Taxes - US We collect sales tax, as required by law. Shipping We make every effort of shipping within 3 business day of payment clearing. The estimated delivery time is 2 - 5 business days from the shipping date. Policies If you do need to return your item, please contact us via email (you will receive an email when your product ships with additional details - Subject: Important information about your purchase). You will then be provided with a return shipping label and packing slip. Pack the item carefully. Include the packing slip, apply the shipping label, and return the item within 30 business days of the date you request a return, or your return will be canceled. Once we receive your order we will inspect the return. Please allow up to 5 business days of receiving the returned item for your refund.