Security monitoring equipment technology research and development and security monitoring engineering; Electronics and Intelligent Engineering; Building intelligent engineering; Construction Engineering; Fire Engineering, Sandblasting anti-corrosion engineering; Design and construction of security monitoring equipment; Professional design and construction of lightning protection projects; Communication engineering design and construction; Design and construction of water supply and drainage equipment; Repair, installation and maintenance of mechanical and electrical equipment; Sales and maintenance of marine equipment; Communication base station equipment leasing( Except for radio transmitting equipment); Investment in communications projects; Communication information network system integration, Communication equipment technical services; Computer software and hardware technology development; Tower construction、 maintain、 operations; Base station room、 power supply、Construction of air-conditioning supporting facilities and indoor distribution systems、Maintenance operations and base station equipment maintenance; Network Engineering Design; Computer software product sales and after-sales service; Sale: Computers and spare parts, Power supply equipment, water supply equipment and accessories, Communication equipment, Electronics( The above two items do not include radio transmitting equipment), Building Materials; Warehousing( Except for refined oil、 Storage of hazardous chemicals and hazardous waste); Import and export of goods or technology( law、 Projects prohibited by administrative regulations shall not be operated)。( All of the above business items except hazardous chemicals)( Projects that require approval according to law, Business activities can only be carried out after approval from relevant departments)