1.2 Sensitiveness: 6D double coil with Double Bass, metal cavity 1080Db, sensitivity, fidelity. 2.3 definition call: voice fiber, deep noise reduction, reduces external noise for clearer voice calls and a purer listening experience. 3.4 Ergonomic design: ergonomic design for very comfortable wear. 4.1 For running: upgraded firmly, even during running, fitness and other sports, it can be worn stably. Use scenarios Sports and workouts: Designed to stay securely in place during running and other fitness activities, providing stable wear and reliable audio. Daily calls and listening: Suitable for phone calls and music during commuting or daily use, with sensitivity and noise reduction for clearer calls. Noisy environments: Deep noise reduction helps minimize external noise, enabling clearer communication and better listening in busy or outdoor settings.