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Shanghai Zhongchangjiang Telecommunication Technology Corporation, with registered capital of 4.5 million dollars, is located in Pudong new district, a corn economic zone in Shanghai. The factory covers more than 50 acres with more than 15 assembly lines for the production of radiation free headphone. Its monthly production and sales revenue has reached 15million yuan. It has become world’s leading manufacturer that integrates design, development and production of radiation free headphone and safe mobile phone. Kangdao radiation free headphone, one of its representative inventions adopts 5 advanced patented techniques, like unique acoustic wave and exclusively-owned metal shielded wire, small speaker. It took the lead to come up with the new concept of safety and health and in the headset industry. It also made a breakthrough in developing and producing radiation free headphone. Until now, it has achieved ten invention patents from the USA, Australia, Germany, Russia, Canada, Japan, Korea, China, Israel and PCT.The radiation free products has achieved good marketing response for its high safety and good quality since it’s lunched. At present, they are mainly sold to the USA, the UK, Germany, Australia and more than 20 other developed or developing countries. In the domestic market, the radiation free headphone serves as accessory part for mobile phone manufacturer like Konka, Gionee. In 2105, it open digital flagship store on Tmall, starting on-line and off-lines sales simultaneously, which is welcomed by customers at home and overseas.