国产欠欠欠18一区二区,一级录像免费录像在线观看,成人无码在线视频网站,国产97人人超碰caoprom,精品久久婷婷丁香51

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.