Shanghai Zhongchangjiang Telecommunication Technology Co. Ltd is located in Pudong New Area, Shanghai and it covers about 40000m2 with advanced processing equipment lines. Its parent company, Wenzhou Changjiang Automobile Electronic System Co. Ltd, a golden supplier of an automobile electric appliance established in 1980, is a nominated supplier of many automobile OEMs, like GM, VW, FAW-VW, SVW, SGM, SAIC, Chang&＃039;an Ford, Beijing Hyundai and FAW Car, etc. Its main products, including electronic/electric switches, modules, central stacks on IP, AC controls, and electronic clocks, typically for such brands as Audi A6 (L), Audi A4(L), Audi Q5, Magotan, Regal, Bora, Passat as well as for many trucks, light vehicles and minibuses, come in over 6000 categories, of which 200 obtained approval from both VW and Audi. FC Changjiang radiation-proof earphone is a kind of new concept product which firstly introduces the concept of safe and healthy earphone and a pioneer of "green earphone" across the world. Our advanced R&D center focuses on the earphone researches and development and contributes to innovation and technology upgrading in earphones industry. FC Changjiang radiation-proof earphone was patented both in Germany in 2006 and in China in 2009. For its radiation-proof function, it is very competitive with high quality in earphone market and has good reputation from our customers. It is a nominated earphone supplier of Konka in China. As people pay more and more attention to their health, Shanghai Zhongchangjiang will offer the best radiation-proof solution service.