Forget about noise cancellation with these on your head !!! The Skullcrusher's bass amplified subwoofer speakers will literally pump the music right into your head! These power packing headphones feature an adjustable in-line bass amplifier and speakers with industry first built-in vibrating subwoofers. Skullcrushers give you the feeling of total audio immersion, and are perfect for portable DVDs, bass heavy music, or outdoor listening. On top of all that, they are the ultimate for any Gamer. Engineered to provide the ultimate home theater experience to those on the GO¿Designed to conveniently fold up with a travel pouch, complete with a home stereo adaptor jack and funky airline adaptor for you rock stars on cross-country trips. AA Battery included.