Retail of computer software, hardware and auxiliary equipment; Wholesale of computer software, hardware and auxiliary equipment; Sales of power electronic components; Repair of communication equipment; Computer and communication equipment leasing; Maintenance of electronic and mechanical equipment (excluding special equipment); Sales of electronic components and electromechanical components; Sales of special electronic equipment; Sales of electronic products; Software development; Sales of electronic measuring instruments; New material technology promotion service; Information technology consulting services; Computer system services; Supply chain management services; Internet sales (except for sales of goods requiring permission); Office equipment sales; Sales of office equipment consumables; Technical service, technical development, technical consultation, technical exchange, technology transfer and technology promotion; R&D of new material technology; Sales of communication equipment; Computer and office equipment maintenance; Wholesale of electronic components