The switch contact can fulfill one or both of the following functions: Switch detection: the ventilation system will perform an action when a (double-pole) voltage-free contact closes. Suitable for toilet detection, connection with heat pump or overrule mode (only one function per switch contact). Repeater: The switch contact is excellent as a repeater to amplify the signal in case of RF communication problems. In that case, the switch contact must be positioned in such a way that the distance to be bridged becomes smaller and/or the signal is less hindered by obstacles. Thanks to its small dimensions, the switch contact is easy to hide.