SONOFF DW2-Wi-Fi - Wireless Door/Window Sensor

Documents User Manual and Certification, 【No Gateway Needed】The sensor is paired with App via Bluetooth and is controlled on App via WiFi.
【Low-Battery Reminder & History Records Check】There is a reminder on App about the low battery, and 3-month history records are automatically saved.
【Status Sync & Camera Binding】Check the status of the sensor through App to get the real status. You can also add a camera to view.
【Easy Installation】With Simple peel and stick installation, it is easy to fit in door frames and window sills.
【Note】Batteries are not included in the package.