General items: communication equipment, mobile terminal equipment, mechanical and electrical equipment, electrical equipment; electronic product; Retail of hardware products, distribution switch control equipment: batteries, security equipment, refrigeration and air conditioning equipment: building materials: metal chains and other metal products, advanced power electronic devices, optical communication equipment, household appliances, network equipment, electrical instruments and meters, power electronic components; Wholesale of computer software and hardware and auxiliary equipment, computer software and hardware and auxiliary equipment, building waterproof coiled material products: application for line and cable operation: security system monitoring service, import and export of goods or technology