R&D, production, sales and provision of technical services for tire repair devices, air suspension devices, electric motors, tire pressure monitoring devices, pressure gauges, electronic pressure sensing equipment, car seat pneumatic systems, power steering systems, mechanical or electronic valves, and integrated wiring harnesses for automobiles (including new energy vehicles) services; manufacturing and sales of integrated wiring harnesses, valves and electronic components required for the household and commercial appliance industry; self-operated and agent import and export business of various commodities and technologies (except for commodities and technologies that are restricted by national companies or prohibited from import and export); development, manufacturing, sales and maintenance of tooling molds. ; Licensed items: Production of Class II medical devices; Production of medical masks General items: Sales of Class II medical devices; Retail sales of medical masks; Wholesale of medical masks; Production of daily masks (non-medical); Manufacturing of daily chemical products; Sales of daily masks (non-medical)