Design and construction services for security technology prevention systems; Security system monitoring services; Security consulting services; Firefighting technical services; Technical services, technology development, technology consulting, technology exchange, technology transfer, and technology promotion; Production of security equipment; Sales of security equipment; Sales of fire-fighting equipment; Sales of digital video surveillance systems; Sales of cloud computing devices; Internet sales (except for the sale of goods that need to be licensed); Sales of electronic products; Sales of communication equipment; Sales of mechanical and electrical equipment; Sales of labor protection equipment; Retail of hardware products; Maintenance of electronic and mechanical equipment (excluding special equipment); General equipment repair; Electrical equipment repair