Follow the below procedure to install the FIBARO door/window sensor as a reed sensor:
Gently open the front case,
Remove the Ï’m ready" tag that has been placed purposely to avoid battery discharging.
Close the casing and place the sensor in the desired location.
Note: Place the device and the reed sensor as shown below. The maximum distance between them should not exceed 5 mm.
Tap on the Sensor (TMP button) thrice to wake it up.