The KNX B8-TH is an extremely compact interface that fits into any switch box. Via eight binary inputs, contacts for example for windows can be integrated into the KNX building bus system. Connected push buttons can be used for dimming, switching or up / down movement. An input designed for a temperature feed probe is used for example for the monitoring of the heating / cooling system. If necessary, an additional external thermo-hygrometer provides current values for the ambient and ventilation control of the KNX B8-TH. The appropriate sensor is integrated into the switch series of the building.