R&D, production and sales of circuit boards, electronic assembly copper-clad laminates, circuit boards and related electroplating (gold, silver, copper, nickel, tin), R&D, production and sales of smart home appliance controllers, automotive electronic controllers, industrial automation system controllers, self-operated and agent import and export business of various commodities and technologies, and import and export business of mechanical equipment, spare parts, raw materials and technologies required by the enterprise.