Sales of electronic products; Sales of electronic special equipment; Manufacturing of display devices; Sales of display devices; Computer system services; Manufacturing of other electronic devices; Wholesale of computer hardware, software, and auxiliary equipment; Manufacturing of electronic special equipment; Wholesale of electronic components; Development of network and information security software; Software development; Technical services, technological development, technical consultation, technical exchanges, technology transfer, and technology promotion; Information system integration services; Design and construction services for security technology prevention systems; Security system monitoring services; Leasing of non-residential real estate; Property management; Construction of landscaping projects; Professional design services; Domestic trade agency; Import and export of goods; Import and export of technology; Research and development of electronic special materials; Manufacturing of computer hardware, software, and peripheral equipment; Sales of metal structures; Sales of optical communication equipment; Sales of internet equipment; Operation of wires and cables; Sales of security equipment; Sales of artificial intelligence hardware; Sales of smart home consumer devices; Conference and exhibition services. (Except for items that require approval according to law, business activities shall be carried out independently in accordance with the business license. ) Design of intelligent building systems; Construction engineering; Construction engineering design; Interior decoration and finishing of residences; Sales of specialized products for computer information system security.