Smart Home Wireless Magnetic Door & Window Sensor — Door Opening Detector Alarm

Compact wireless magnetic sensor for doors and windows that integrates with your smart home. App Notification: when the triggering distance is >20mm the device sends a "Door Alarm"; when the contact is restored it issues a 'Closing reminder'. Tamper Alarm: equipped with a built-in tamper switch that triggers an immediate alarm if the unit is removed illegally and pushes the message to the APP. Smart Power Saving: 3 Years of Long Battery Life. Low Power Warning: when battery level is low the sensor will push messages through Tuya/Smart Life to remind you to replace battery in time. Exquisite Details: Minimalist design, acrylic material, replaceable battery.