Door And Window Sensors Wifi,Smart Door Open/Closed, Battery Not Included Product Features Wireless connection?By connecting WIFI and mobile phone connection, whether you are where, Instant notification to your phone immediately when door or window is opened or closed. Multipurpose Sensor:Install the Alarm Sensor not only on front doors or windows, but also on garage doors, liquor cabinets, front gate, safety deposit box, pet doors and more. Easy Installation:Very easy to install via the tapes mount on door or window frame. Tapes and screws included, everything you need to get started is in the box. NOTE: Make sure that the sensor and magnet are aligned and gap less than 10 mm. Compatible with Alexa Google Home:No hub required and No fees charge. Product quality and service:Our products are 100% tested and ensure that all products are qualified products before leaving the factory. Please rest assured to purchase and use. Shipping: Shipping is complimentary within the lower 48 US States. We Do Not Ship to PO/APO Boxes, HI or Alaska We Do Not Ship Outside of the Continental US All items ship within 24-72 hours of Payment For large items that require Freight shipping a valid phone number is required to call and schedule your delivery Terms of Sale and Feedback: Feedback is extremely important to us and If you are satisfied with our transaction, please take a moment to leave Positive Feedback. YOUR Satisfaction is our #1 Priority! If there are any issues, PLEASE contact us BEFORE leaving a neutral or negative rating so that we may resolve any concerns. We PROMISE we can make you happy if you give us a fair chance. Returns / Concerns: All items qualify for returns within 14 - 30 days of receipt. Buyer is responsible for return shipping on any item that is not damaged Please be sure this is an item you want before making your purchase. Customer Satisfaction is our TOP priority! All items are IN STOCK at time of listing. Inventory changes constantly and it is impossible to maintain a perfectly accurate count of all items. Please do not penalize us if we have to issue you a refund! Thank You For Your Business!