Why does the bell sound in the street when someone presses the panel?

Why does the bell sound in the street when someone presses the panel?

The sound on the outdoor panel confirms that the call has been made for the visit. It is a good design practice considered to facilitate the use for all people and moreover those with some form of visual impairment.

The volume can be regulated during installation so that it is suitable for the level of noise in the street.
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