Zhang Gang, the State Council Counselor and his entourage, accompanied by Guo Xiaoyu, the deputy director of Shenzhen Market Supervision Bureau, visited Grandsun on Dec. 29^th, 2011. They tried the intelligent noise cancelling headphone and thumbed up for its outstanding noise cancelling effect. Grandsun has dedicated in efforts of R&D and industrialization of intelligent noise cancelling technology to improve the user experience feeling. This technology has been largely applied in the fields of industry, people livelihood, music enjoyment and hearing protection.