R&D, production and sales: temperature testing instruments, gas testing instruments; sales: electronic equipment, electromechanical equipment, testing instruments, hardware accessories, instruments and equipment, metal products, communication equipment, electronic components, mechanical equipment, auto parts, motorcycle parts, refrigeration equipment, daily necessities, knitted textiles; development and maintenance of computer software and hardware; self-operated and agent import and export business of various commodities and technologies (except for commodities and technologies that are restricted by the state or prohibited from import and export).