Project management and complete execution of building management systems in the fields of heating, ventilation, air conditioning, refrigeration and electrical engineering in the building technology sector, as well as provision of all related services; sale and trade of field devices, as well as consulting services for planners, architects and installers and end customers regarding the installation, maintenance and optimization of building technology systems; may acquire, manage, build, encumber and sell properties; may engage in patent and licensing transactions and participate in or acquire other companies.