A Neutral Wire Is Required For Installation. Martin Jerry'S Smart Dimmer Switch Product Details Dimmer Switch: This is a smart dimmer switch for LED lights. It supports dimmable LED/CFL bulbs (Max 150W) and INC bulbs (Max 400W). Smart Home: This smart switch dimmer is compatible with Alexa and works with Google Assistant for voice control. You can remotely control it on smart phones, and set home automation according to schedules, sunset, sunrise, and etc. Installation: This smart light switch dimmer is easy for installation like a toggle switch. But a neutral wire is required. It is for Single-Pole use (Not 3 way). No hub is required for this Wi-Fi dimmer switch, but 2.4G Wi-Fi ONLY (Not 5G) Advantage: ETL Listed, Over Temperature Protection for Safety, Brightness Memory when turning off, Soft On Soft Off Visual Effect Service: Martin Jerry has a professional support team to solve your problems promptly. Email will be replied within 12hs. We offer 90-Day 100% refund, 1-year Quality Warranty 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.