gesis FLEX is a trendsetting system for room automation. Despite of the fact that automation devices are installed in hollow spaces of ceilings and floors special value has been placed on design and esthetics. Due to the compact size the system is perfectly fitting into the building installation. The modular construction, the devices are plugged together positively and automatically the electrical connections will be done, simplifies every step from the planning up to the operation of the building. The functions can make a significant contribution to the energy saving and sustainability in the scope of building automation.