Design and construction services of safety technology prevention system; Fire electrical detection; Maintenance and inspection of fire-fighting facilities; Fire safety assessment; Installation and maintenance of fire-fighting equipment; Special design services for fire-fighting facilities engineering; Internet of things technical services; Risk assessment and early warning services; Quality and safety inspection and quarantine services; Public safety inspection service; Public facilities safety inspection service; Safety consulting services; Environmental emergency management services; Engineering management services; Education consulting services (excluding education and training activities involving license approval); Software development; Business agency service; Information technology consulting services; Information system integration services; Research and development of mechanical equipment; Procurement agency services; Construction of fire-fighting facilities; Intelligent construction of buildings; Sales of electrical mechanical equipment, electrical signal equipment, stationery, fire equipment, computer software and hardware and auxiliary equipment, electronic products; Electrical fire safety inspection; Fire extinguisher maintenance; Ice and snow clearing service; Urban domestic waste business services