Research, development, production, sales, and after-sales service of environmental protection and energy-saving equipment; environmental protection engineering construction; production, processing, installation, and sales of chemical equipment, electrical equipment, machinery equipment, and accessories; research, development, sales, and technical services of water and gas monitoring equipment; heating, ventilation, and air conditioning engineering construction and equipment sales; design, manufacturing, and installation of signs and banners; design, installation, and maintenance of building intelligent systems; network system integration and maintenance; design, construction, and technical consultation of comprehensive cabling engineering; sales of electronic products, computer network product accessories and consumables, decorative materials, office equipment, and consumables. License projects: construction labor分包. General projects: software development; software sales; environmental protection consulting services.