Surpass All Your Expectation: 1.Use either earbud at a time for calls and music. You can switch freely between twin mode and mono mode. 2. Unlike others, M30 is a thoughtful product. If you lose one earbud, just simply purchase the exact one instead of a new pair. 3. Besides play & pause, M30 also supports volume & tracks control for more convenienceFantastic Immersive Sound with Powerful Bass: Adopted advanced polyurethane drivers to avoid bulky size, M30 provides authentic sound with deep bass even in a small size. Be sure to choose the suitable eartips(S/M/L) to get a better sealing so as to block out noise around and provide fantastic music enjoyment even in the highest volumeUnique Ear-Fin Design for Comfort & Secure-fit: Ergonomic ear-fin to disperse pressure and ensure wearing comfort. No more concerns of earbuds falling out. Comes in M/L 2 sizes earfins, M30 is suitable for most people in custom fit. With M30, just move as you want for daily commute or sportsIPX8 Waterproof Sport Earbuds : With Nano coating, Mpow M30 can fend off sweat and it is a good choice for strenuous workouts and all weather conditions. M30 makes an ideal companion while jogging, running, yoga, sports, gym, cycling etcUSB C Quick Charge & 25hrs Playback: Earbuds supports 5hr playback and the case supports up to 4 full charges. With type-C quick charge, it only takes 1.5hr to charge the case.[ What’s more] Mpow insists on providing quality products and is acknowledged by tens of millions customers around the world. [ Note] Due to system restriction, Android users want to get the maximum volume please be sure to adjust the volume on your phone to its maximum at first.