Compliant With Both Alexa And Google Assistant, The Heiman Wifi Door Sensor Is A Product Details ?WIFI Connection Real-Time Alerts? By connecting WIFI (2.4G only) and mobile phone connection, whether you are at home or on the go, the intelligent WiFi contact sensor sends a notification to notify you when the door / window is open or closed (Note: Support only: Wi-Fi 2.4 GHz.) ?Easy To Use? Easy set up of the sensor for open doors in a few minutes - without tools or professional installation. Add components for overall house protection at any time. No hub or subscription service is required. Simply connect it to your Wi-Fi network and download the "Smartlife/ tuya"app from the App Store. No monthly fee! ?24/7 Pro Monitoring?: Door window sensor offers round the clock monitoring of your home. Use on doors, windows, cabinets, drawers or anywhere you want to notified when it is opened or closed. It's easy for you to keep an eye on the security of your house anytime anywhere. ?Long Battery Life?: Door sensor with low power consumption offers a battery life of approx more than 1 year. The super long battery life avoids frequent replacement and gives you a better experience. ?Widely Application? Install the alarm sensor not only on front doors or windows, but also on garage doors, liquor cabinets, front gates, lockers, pet doors and more. And we offer replacement or refund if you have problems with your Smart Door Window Alarm Sensor. 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.