Double unit, four speakers: rich music details, loose and attractive sense of hearing. Whether its pop or rock, ACG or dance music, every note is clearly presented. CK8 is equipped with an 8mm mid-to-treble dynamic coil unit + a 10mm subwoofer dynamic coil unit, which are responsible for mid-to-treble and heavy bass playback respectively, so that CK8 not only has a natural and comfortable mid-to-high frequency extension, but also presents faster and more Strong bass effect.45 inclined ear design: According to the ergonomic design, combined with the contour of the human ear, it is comfortable and natural to wear and not easy to slip off. Two wearing methods, long-term wearing is painless and firm. When running, fitness and cycling, wear it around the ears to make it stronger.Pull-resistant and fold-resistant crystal wire: Flexible three-dimensional wire, wrapped with a layer of transparent hard film, making the wire tougher and more durable, reducing entanglement.3.5mm standard interface, durable: compatible with a variety of 3.5mm playback devices on the market: mobile phones/computers/tablets/MP3, etc. (Note: OPPO phones are not supported)High-definition call MIC: One-button design, easy to operate, one-button line control, sturdy and durable.