Nothing to say except this shirt is surprising me. Powered by 4 AAAA battery (packed in small box to fit the small pocket inside, the T-Qualizer Shirt displays a fully functioning graphic equalizer that dynamically changes responding to any ambient sound or music. It is works like common equalizer that each bar animated depending on sound frequency. Just imagine you were in the night club wearing this, it so cool, believe me! Available in black color, you can buy it at thinkgeek.com for $39.99. Be careful don`t throw this shirt to washing machine!