1. Professional TuningPure Sound Dual speakers + dual inverted tube acoustic structure, aftermany professional tuning sound more moist and beautiful. 2. Skin-friendlyRubber SurfaceWarm touch, skin-friendly and delicate. Certain cushioning effect protects thesound from damage due to falling. 3. Full-range unit withnatural clarityCustomised 52MM full-rangeunit, the treble is clear andnatural, and the bass is thickand powerful, accuratelyreproducing every note.