Instructions

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8. Inserting / changing the battery
LED status messages after inserting a battery:
LED lights up green for 1 sec.: Battery is full
LED lights up blue for 1 sec.: Battery is no longer
completely full*
LED lights up red for 1 sec.: Battery is nearly empty
LED does not light up: Battery is completely empty
* It may be that new batteries are also not fully changed.
3. Continue with the installation if it is the initial installation
or
Press the cover rmly onto the sensor part again
after changing a battery.
Information about the battery life
The battery life can be reduced due to the following factors:
Use at very low and high temperatures.
Frequent status changes (e.g. opening / closing a door).
Number of logged-on DuoFern devices.
Recommendation:
Do not install the DuoFern Window/Door Contact in the
window frame in unheated rooms, but on the inside of
the window frame.