1.Cowin is an 13 year history Audio Electronis Innovator, has more than 120 patents in mainland china, 20 PCT international patents, including 10 invention patents for ANC headphones, BTand wifi speakers.2.All products are development to meet the international standards and with certificates such asCE,FCC,UL,SAA,RoHS,REACH, PAH,KC,TELEC etc.3. Our products are sold to Microsoft ,Walmart and Apple store.4. COWIN aims to satisfy customers' demand. We believe that only innovative and high quality products can benefit customers. We welcome customersall over the world to join us for a long term cooperation business and win-win relationship.