Technical development and sales of electronic products and communication equipment; Wholesale and retail of craft gifts, handicrafts (except ivory and its products), fire fighting equipment, labor protection products, security equipment, mechanical equipment, hardware building materials, clothing materials, textiles, digital products, office supplies, computers and peripheral products, clothing; Sales of chemical products (excluding dangerous chemicals, precursor chemicals, refined oil); Technical development and sales of electronic components, integrated circuits, optoelectronic products, semiconductors, solar energy products, instrument accessories, digital television broadcasting products and communication products; Development and sales of dryers, industrial dehumidifiers, purification equipment, mechanical machinery, refrigeration equipment; R&D and sales of intelligent transportation products; Conference public broadcasting equipment, avionics, test equipment technology development and sales