Forget about noise cancellation with these on your head!!! With the Crusher in-line AA battery powered bass amplification and industry first vibration subwoofer speakers, they will literally pump the music right into your head! You can adjust the amount of bass effect with the in-line control wheel. The Crushers are ideal for the Outdoors, Portable DVD, Bass heavy music and are the ultimate for any Gamer. Engineered to provide the ultimate home theater experience to those on the GO? . Designed to conveniently fold up, travel pouch, and complete with a home stereo adapter jack.