Qiaonan Street, Longdong Community, Longgang Street, Longgang District, Shenzhen City. According to the search on Baidu Map, the address of Longdong Second-hand Computer Trading Market is Qiaonan Street, Longdong Community, Longgang Street, Longgang District, Shenzhen. Second-hand computers refer to computers that have been used for a period of time or have had some hardware damaged and then been recycled and then re-entered the trading market after repairs.