SONOFF DW2 Door And Window Sensor
This sensor is paired with App via Bluetooth and is controlled on App via WiFi. There is a reminder on App about the low battery, and 3-month history records are automatically saved. Also it ensures the ability to check the status of the sensor through App to get the real status. You can also add a camera to view, with Simple peel and stick installation, it is easy to fit in door frames and window sills.
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