Technology development, design, and sales of optical transmission equipment, broadband network equipment, monitoring equipment, cable TV equipment, digital TV equipment, computer equipment and software, and communication equipment; Network technology development; Technology development and design of audio-visual equipment and related multimedia systems; Sales of audio-visual equipment; Technology development, technical consultation, and sales of large-screen controllers and large-screen display equipment; Technology research and development and sales of LED color screens, LED lamps, LCD products, rear-projection products, plasma products, optoelectronic products, advertising players, security products, and digital electronic products; Domestic trade; Wholesale and retail of textiles, feather products, garments, daily necessities, cultural goods, sports goods and equipment, leather, furs, shoes, wood, bamboo, rattan, palm, and straw products, furniture, paper products, chemical raw materials and chemical products (excluding hazardous chemicals), rubber and plastic products, non-metallic mineral products, metal products, general equipment, electrical machinery and equipment, computers, communications and other electronic equipment, instruments and meters, mechanical equipment, hardware products and electronic products, disinfection supplies, Class I medical devices, signs and labels, office supplies and consumables, interior decoration materials, fire-fighting equipment, aquatic products, fruits, vegetables, labor protection supplies, protective helmets, electric bicycles, building materials, flowers and seedlings, pet food and supplies, cosmetics, hygiene products, and maternal and infant products; Software development; Computer information system integration; Business information consulting; Design, on-site installation, and construction of weak current engineering, fire protection facility engineering, and electromechanical equipment engineering; Leasing of self-owned houses; Leasing of construction machinery and equipment; Container leasing; Office equipment leasing; Leasing of entertainment and sports equipment; Leasing of furniture and household appliances; Leasing of tools and hand tools; Leasing of computers and communication equipment; Import and export of goods and technology; (for projects subject to approval in accordance with law, business activities can only be carried out after approval by the relevant departments) information system integration services; Information technology consulting services; Software development; Communication equipment manufacturing; Engineering management services; Information system operation and maintenance services. (Except for projects subject to approval in accordance with law, business activities can be carried out independently in accordance with the law with a business license) ^ Sales of publications, refined oil products, prepackaged food, and alcoholic beverages; Sales of packaging and decoration products and printed matter; Construction project construction; Design of building intelligent systems; Electrical installation services; Sales of special products for computer information system security. (For projects subject to approval in accordance with law, business activities can only be carried out after approval by the relevant departments; The specific business items shall be subject to the approval documents or licenses of the relevant departments)