Sound Activated Light Up Flashing Rock Disco Equalizer EL LED T-Shirt Size XXXL This shirt lights up and reacts to sound, Volume Control for the sensitive of music. Made from 100% cotton, this high tech,Hand Washable, just unplug the battery box. Has a sound sensitivity control to take you all the way from loud anthem beats to the chill out room. Powered by a battery pack cleverly hidden within an inside shirt pocket. Good for music or dance fans and sports fans, especial for Hip Hop fans.