Sonoff ZigBee Wireless Magnetic Door/Window Sensor (with battery)

【Monitoring Doors & Windows】Automatically turning on lights when a door is opened, triggering audible and visual alarms in case of unauthorized entry, and sending app notifications to keep you informed.
【Tamper Alert】Equipped with tamper-proof features ensures your peace of mind. You will receive App notifications on your phone if the sensor is tampered with.
【5-Year Battery Life】Powered by CR2477 battery extends the battery life to over 5 years, eliminating concerns about frequent battery replacements.
【Zigbee 3.0 Compatible】 Seamlessly integrates with Zigbee hubs utilizing the Zigbee 3.0 protocol, such as SONOFF NSPanel Pro, SONOFF iHost, SONOFF ZB Bridge Pro, SONOFF ZBDongle-E, and Echo Plus 2nd…
【Local Smart Scene】With Local smart scene, scene linkage between Zigbee devices can be executed normally as long as your Zigbee devices are powered on even if the network is disconnected.

Note : SNZB-04P needs to be used with Zigbee Hub.