The u::Lux Switch dS is an intelligent room control device for building automation. The switch can be used for flexible operation of electrical systems such as multimedia, lighting, shading, heating and ventilation, as well as alarm systems. Temperature, humidity and/or the CO2 content of the air can be shown on the display, as can user-defined alarms, information and weather services. The switch also offers the option of reporting fault or alarm messages acoustically and visually.