General projects: Research and development of household appliances; Audio equipment manufacturing; Audio equipment sales; Sales of electronic products; Electronic components manufacturing; Electronic components wholesale; Electronic components retail; Sales of household appliances; Sales of metal products; Research and development of metal products; Non-ferrous metal casting; Nonferrous metal alloy manufacturing; Non-ferrous metal alloy sales; Musical instrument manufacturing; Musical instrument wholesale; Musical instrument retail; Musical instrument spare parts sales; Smart home consumer equipment manufacturing; Sales of smart home consumer devices; Sales of industrial control computers and systems; Manufacture of industrial control computers and systems; Data processing and storage support services; Manufacturing of special teaching instruments; Sales of special teaching instruments; Electrical equipment sales; Lighting appliance manufacturing; Lighting appliance sales; Mechanical and electrical equipment manufacturing; Mechanical and electrical equipment sales; Electronic and mechanical equipment maintenance (excluding special equipment); Sales of radio, film and television equipment; Sales of radio and television transmission equipment; Import and export agent; Advertising production; Advertising release; Advertising design, agency; Computer hardware, software and peripheral equipment manufacturing; Retail of computer hardware, software and auxiliary equipment; Sales of terminal metering equipment; Technical service, technology development, technology consultation, technology exchange, technology transfer, technology dissemination; Software development; Information system operation and maintenance services; Internet sales (except sales of goods that require a license); Non-residential real estate leasing; Housing rental