Abus FU8200 Manuel D'installation page 33

A small hole at the bottom-right of the housing provides
access to an internal switch that is used for monitoring the
signal strength.
6. Acoustic signal tones
The info module can generate a whole series of acoustic
signal tones. These are similar to the signal tones of the
wireless alarm centre. At the same time, the internal
piezo signaller of the wireless info module is activated
during an alarm and thus serves as an additional internal
siren.
The following table gives an overview of the signal tones
and their meaning.
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