Shenzhen Groove Industries Co. Ltd. , the Professional Earphones and Headphones Manufacturing Group with Export Licence , has two factories: one is Hisonic Enterprises Co.Ltd, a wholly-owned factory established 1996, ; Second is Groove Group Santou Yihao Industrial Co. Ltd. established 2004, Now it has 6 production lines ,1 pritning line and 3 packaging line and 28 injection machine with 260 workers, 400,000 PCS big headphones and 300,000pcs earbuds / month production capacity. We owned two main brand: Hisonic ,Yusonic. and with ISO9001, BSCI ,CE, ROHS, FCC ,reach, prop65, certificate .We had already focus on headphones line more than 28 years and have a very strong OEM & ODM project researching and developing team, "Give me a chance and give you a satisfactory result "