The Andowl Wifi Door/Window Sensor is the perfect security solution for your home or office. This sensor comes with a manual to prevent any damage during installation. It also features tamper protection to ensure that you are alerted if someone tries to tamper with it. The low battery alert ensures that you are always aware of the battery life of your sensor. This sensor is compatible with Amazon Alexa, allowing you to control it with your voice. OTA firmware upgrade is also supported, ensuring that you always have the latest features and updates.