Research on building materials; Research and experimental development of engineering and technology; Manufacturing of building materials (limited to branches); Design and consulting services of building materials; Sales of building materials, access control system, safety door system and security monitoring; Leasing of construction equipment; Business leasing of construction machinery and equipment; Security monitoring design; Communication technology, fire technology and intelligence The research and development of chemical technology; Computer network system engineering services; The design and installation of anti-theft system; The design and installation of monitoring system; The design and installation of access control system; The design and installation of security door system.