Ever worried about intruders entering your home in the middle of the night or when you're away? Give your home the extra protection that it needs by equipping your doors and windows Is the perfect way to protect your home or office. This handy little device is easy to install and link up with your smart device. It keeps you alert and informed whenever a door or window is opened in your home. Plus, it sends instant notifications directly to your phone once it detects even the slightest shift in the positioning of your door.