Sound Activated Flashing light up and down LED Panel EL T-Shirt led light up t-shirt el sound sensitive t-shirt Sound Activated Flashing light up and down LED Panel EL T-Shirt This LED EL T-shirt is made of 100% cotton. It has an electro-luminescent panel (EL) across the front that reacts to music and and 'pump' in time with whatever you are listening to. It also gives a visual rhythm guide to ...