Aller Retour: Allows you to control the same light from two different locations. It is ideal for the beginning and end of a hallway or for the room entrance and your bedside table.
Medium: It is used when you want to control the same light from three or more locations (e.g. in large corridors or staircases). It always works together with two Aller-Retour switches at the ends of the installation.
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