Rock out All Day in Style: The ergonomically designed nx80 reproduces high definition, bass-driven sound without the need for batteries. The in-line microphone is acoustically tuned to filter out external noise, ensuring that the callers can hear clearly, even in the noisiest situations. With three size options of comfort-fit ear gels, you are ensured the perfect fit to seal in sound and block out ambient noise for a truly immersive audio experience. Crank it up and rock out in style.