It is a line of switches for controlling appliances such as lights, heating, louvre blinds and windows. It features a reduced number of intuitive control elements for user friendliness. The HomeMaster is based on an open operating system to which new functions can be added simply in form of software modules. The clear design and ergonomic benefits of the system are readily apparent in well as the menu-based GUI. By means of it the user can access information at any time by rotating the dial or pushing the button. Various interfaces to other systems can be incorporated and the unit can be linked up to multimedia concepts. The user can configure the GUI himself.