Sound actived el t-shirt 1.100%cotton,180g 2. CE and SGS approved 3.more than 300 designs 4.supply ability: 1000 pcs/week Sound actived el t-shirtSound actived el t-shirt, also called el equalizer flashing t-shirt. It is a t-shirt with a panel in the front of it which can flash with the beat of sound. When you are talking with others, listening to the music, and even hearing some voice around, ...