Tuya ZigBee Smart Door Window Sensor, Door Open/Closed Detector Need Gateway A ZigBee hub is required to connect the device to the Internet. (The hub is not included) Just add the hub to the Smart Life/Tuya App, and then add the sensor to the ZigBee hub. Low Power Consumption Battery Powered, low power consumption; brand new design, using Hall sensor technology, anti-tampering; support low battery reminder. Easy Installation Paste installation, no complicated tools, simple installation, and freedom. It is not easy to fall and will not damage the appearance of the original house and the cleanliness of the walls. Real-Time Monitoring No matter when and where, once you open or close doors and windows, you will receive notifications via your smartphone. Always keep your house safe. You just need to always connect the sensor to the ZigBee hub. It is your indispensable home security sensor. Wide Range of Applications You can apply smart door and window sensors to different scenes, bedrooms, garages, bathrooms, gardens and any place you like, and realize smart life through the linkage of smart door and window sensors.