ZigBee Door and Window Sensor Wireless Contacts Sensor Support Home Device Intelligence Linkage APP Notifications (Open/Closed) ZigBee Hub Required for Home Alarm System Upgrade your safety system with this intelligent door and window sensor. Automatically alerting you through the APP when doors or window are opened, this sensor supports ZigBee 3.0 protocol for smart home integration. With low battery reminders and a history log, this easy-to-install sensor is perfect for homes, shops, offices, and classrooms. Stay protected and connected with the versatile and reliable sensor. Features: Intelligent door and window sensor, automatically activated when the door or window is opened or invaded by external objects, and immediately pushes the information to the APP, perfect for home alarm system. Supports ZigBee 3.0 protocol, can be used with compatible Zigbee hubs or Echodevices with built-in Zigbee hubs, supports smart home device linkage. The phone APP provides low battery reminders, allowing you to replace the battery in a timely manner, and also allows you to view the history records, making every door and window switch traceable. Small and lightweight, easy to install and use, no need to drill holes, just stick the sensor in the appropriate position. Allows for gaps up to 10mm wide. Widely applicable, perfect for installation in homes, shops, offices, classrooms, and other different scenarios, upgrading your alarm system. Specifications: Color: White Material: ABS Protocol: ZigBee3.0 Battery: 1 * CR2032 Button Battery Item Size: 50 * 25 * 12mm/ 2.0 * 1.0 * 0.5in                 30 * 15 * 10mm/ 1.2 * 0.6 * 0.4in Item Weight: 22g/ 0.8oz Package Size: 55 * 45 * 20mm/ 2.2 * 1.8 * 0.8in Package Weight: 29g/ 1.0oz Packing List: 1 * Door/Window Sensor Kit 2 * Double-Sided Adhesive 1 * Card Pin 1 * User's Manual