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The Skullcandy(tm) SCN 2.5 Skull Crusher headphones boast an inline, battery-powered bass amplification and subwoofer system. You can adjust the amount of bass effect with the inline control wheel. The Crushers are designed for use with MP3 players, portable DVD's, bass-heavy music, and gaming. They come with a travel pouch, a home stereo adaptor, an airline adapter, and a AA battery.