Development, production, supporting, sales, engineering installation and maintenance of building equipment and electronic equipment systems, public safety prevention engineering design and construction, real estate development and operation, property management, building construction and decoration, elevator installation, repair and renovation, fire protection engineering installation and maintenance, distribution of home appliances and building materials, communication equipment sales, installation and maintenance, communication network construction, information and data system integration. [Projects that require approval according to law can only be carried out with approval from relevant departments]