Wireless Magnetic Door & Window Sensor — Smart Home Door Opening Detector, High Sound Alarm, Tamper Switch, 3 Years Battery (Tuya/Smart Life Compatible)

Compact wireless magnetic sensor for doors and windows that links to your mobile app. When the contact gap exceeds >20mm the device sends an app notification and issues a "Door Alarm"; when the door is closed it delivers a 'Closing reminder'. A built-in tamper switch provides a Tamper Alarm and immediately pushes an alert to the APP if the unit is removed or tampered with. Designed for efficient operation with 3 Years of battery life; when battery level is low the sensor will send a low-power warning through Tuya/Smart Life to remind you to replace the battery. Finished in a minimalist acrylic housing with a replaceable battery and a clear, high-sound alarm output.