Permitted project: construction engineering; Residential interior decoration; Construction labor subcontracting (projects that must be approved according to law can only be operated after being approved by relevant departments, and the specific business items shall be subject to the approval results) General items: manufacturing of metal signs for transportation and public management; Manufacturing of special traffic safety and control equipment; Maintenance of traffic facilities; Sign sales for traffic and public management; Metal structure manufacturing; Metal structure sales; Sales of metal products; Sales of electronic products; Advertising design and agency; Advertising production; Advertising release; Technical service, technical development, technical consultation, technical exchange, technology transfer and technology promotion; Intelligent control system integration; Manufacturing of domestic waste treatment equipment; Sales of domestic waste treatment equipment; Manufacturing of special equipment for environmental protection; Environmental sanitation public facilities installation services; Sales of special equipment for environmental protection; Management of municipal facilities; Canopy sales; Construction of sports ground facilities; Fire fighting equipment sales; Fire technical services; Construction of landscaping works; Urban park management; Sales of lighting appliances; Urban and rural city appearance management; Sales of building decoration materials; Digital video monitoring system sales; Security system monitoring services