Techniques: Wired earbuds are composed of 12mm dynamic driver and 11.6mm PZT bone conduction. Dynamic driver is air conduction in charge of bass and middle frequency. Bone conduction unit is mainly used as a compensator for medium and high frequency and delivers sound in coordination with bone conduction bracket and earphone cavity. High frequency: The high frequency of ordinary earphone unit is directly transmitted to eardrum through air flow. Earbuds are transmitted through bone conduction, and all the high frequency burrs are cancelled out in the conduction process. Therefore, earbuds' middle and high frequency have good resolution. Hifi sound: Earbuds have improved separation and soundstage through air conduction and bone conduction. The full range of high frequency space and detail transform memory and emotion into powerful sound in your head. The sound is highly separated and the detailed sound is pleasant to the ear. The clear localization that comes from good separation makes for an interesting listening experience. Winter design: Winter faceplate is inspired by the skiing project, and the lines outline the skiing trajectory. Copper silver plated cable: Wired Hifi earbuds have a 0.78mm 2pin single crystal copper silver plated cable, 0.06mm x7x7, 49 core single crystal copper silver plated cable, 4 strand hand braiding threaded cable. Improves instrument sound separation, detail and image.