【Anti-Tamper Alarm】Receive instant alerts when someone attempts to remove the device, ensuring your home remains secure at all times 【Create Linked Scenes】Easily set up smart scenarios in the Smart Life APP—such as having your smart lights turn on automatically when the door is opened 【Remote Alert Notifications】Get notified via the APP when strangers try to break in, as the door sensor detects the intrusion in real-time 【Miniature Grooved Design】Crafted with a grooved design, this sensor adds a sleek and sophisticated touch to your home setup 【ZigBee Hub Connectivity】Seamlessly connects to your smart home system through the ZigBee hub, providing stable and efficient communication Specifications: Wireless Technology: Zigbee Operating Voltage: DC 3V (CR2032 battery, not included) Operating Temperature: -10 to +55℃ Low Battery Indicator: Yes Alarm Trigger Distance: 23±5mm Battery Life: Over 1 year (based on 20 uses per day) Main Unit Dimensions: 65mm x 26mm x 12.7mm Magnet Dimensions: 38.8mm x 10.9mm x 13mm