Engineering and technical research and test development; Retail of electronic components; Sales of electronic products; Sales of special electronic equipment; Sales of mobile communication equipment; Sales of communication equipment; R&D of electromechanical coupling system; Wholesale of auto parts; General merchandise sales; Sales of building decoration materials; Sales of auto decoration products; Retail of hardware products; Wholesale of hardware products; Software development; Software outsourcing services; Research and development of IoT technology; Sales of IoT equipment; Internet of Things application services; Internet of Things technical services; Artificial intelligence industry application system integration service; Network and information security software development; Tea set sales; Jewelry retail; Jewelry wholesale; Internet sales (except for sales of goods requiring permission); Sales of daily necessities; Wholesale of daily necessities; Sales of maternal and infant products; Sales of personal hygiene products; Sales of sanitary ware; Information system integration service; Information consulting service