The ergonomically designed NoiseHush NX80 features patent pending bass system to reproduce high definition, bass-driven sound without the need for batteries. The in-line microphone of the NX80 is acoustically tuned to filter out external noise, ensuring that callers hear clearly even in the noisiest situations. With its control button, you can conveniently switch between phone calls and your favorite music. The tangle-free eliminates the hassles and damages caused by frequently entangled cords. Crank it UP!