1. confortable for long time using, 2. high quality , high sound effective 3. Sport mp3 earphones 1) INTRODUCTIONWe, Ko-Star, are committed to designing and producing high quality and stylish headphones.By more than 10 years manufacturing experience, we have organized a professional designer/engineer team for the whole production line, as well as effective and successful QC system from mould to ...