Guanglan has various patents and intellectual properties pertaining to its products, which boast the most efficient technology to implement strong sound vibration and bone conduction. Generally, most of the speaker in the market, the sound propagates through air conduction. Compare with the other speaker, iFeelu DMS used the bone conduction; it¡¯s had strong Competitive in hearing protection field than the other earphone. Bone conduction speakers are not very popular. The main reason is people do not know much about the new technical. So we must expand its promotion and let the customers got the firsthand experience in the store. Leading them to make a desertion easily.