Technical services, development, consultation, exchange, transfer, and promotion of lighting fixtures; Sales of lighting fixtures; Sales of semiconductor lighting devices; Professional design services; Sales of photovoltaic equipment and components; Battery sales; Internet of Things technology services; Research and development of emerging energy technologies; Sales of mechanical equipment; Sales of building decoration materials; Metal structure sales; Sales of non-ferrous metal alloys; Sales of plastic products; Sales of non-metallic minerals and products; Wholesale of stationery supplies; Retail of stationery supplies; Sales of labor protection equipment; Sales of chemical products (excluding licensed chemical products); Wholesale of computer software, hardware, and auxiliary equipment; Retail of computer software, hardware, and auxiliary equipment; Sales of household appliances; Wholesale of hardware products; Retail of hardware products; Wholesale of kitchen utensils, sanitary ware, and daily necessities; Retail of kitchen utensils, sanitary ware, and daily necessities; Wholesale of bicycles and spare parts