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Shanghai Zhongchangjiang Telecommunication Technology Co.,Ltd. located in the No.5829, Hunan Road,Hangtou Town,Pudong New District,Shanghai 201316,China. With an area of 49000㎡. ibrain radiation free headphone was patented in German, China, USA, Japan, Australia and etc. The unique ibrain air tube radiation free earphone adopted unique acoustic channel technology, and metal wire isloate the radiation of conductor electromsgnetic waves technology. It is the first-rate radiation free in the world. It has been produced in mass with the annual output value 3000 millions.