Technical services, technology development, technical consultation, technology exchange, technology transfer, technology promotion; Computer system services; Data processing services; Security system monitoring services; Project management services; Fire technical services; On-site assessment technical services for fire protection acceptance of construction projects; Design and construction services of security technology prevention system; Network and information security software development; Commercial complex management services; Foreign contracted projects; Industrial engineering design services; Sales of electronic products; Sales of communication equipment; Sales of digital video surveillance systems; Sales of fire-fighting equipment; Security equipment sales; Wire and cable business; Sales of building decoration materials; Instrumentation sales; Sales of office supplies; Sales of office equipment and consumables; Retail of computer hardware and software and auxiliary equipment; Sales of household appliances; Sales of daily necessities; Conference and exhibition services; Advertising design, agency; Advertising production; Advertising; Sales of chemical products (excluding licensed chemical products); Retail of electronic components. (Except for projects subject to approval in accordance with the law, independently carry out business activities with a business license in accordance with the law) ^ Construction projects. (For projects subject to approval in accordance with the law, business activities can only be carried out after approval by relevant departments, and specific business projects are subject to the approval documents or licenses of relevant departments)