Feel the music? How about seeing the music? Bring the music to life with a Headphone Equalizer T-Shirt, the shirt with the pulsing electroluminescent equalizer on it. Electro-luminescence (EL) lets a tiny electric current through a phosphorus material in the shirt; it does not generate heat and is light, flexible, durable and waterproof. Just flip on the small battery pack that goes in an inside pocket of the shirt and watch the shirt flicker to life with the beat. Cool shirt.