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 others. It is powered by a battery pack inside the T-shirt. And the EL panel can be removed and replaced、 its interface is universal、 you can use other EL panels to replace it. Stylish and convenient.  <br /><br />Size:165cm/85(S)、 170cm/90(M)、 175cm/95(L)、 180cm/100(XL)、 185cm/105(XXL)、 190cm/110(XXXL)、 195cm/120(4XL)、 200cm/130(5Xl) is available.  <br /><br />Description: <br />Led color: Multi-colors、 as show as picture <br />Color: Black <br />Fabric: 100% Cotton  <br />Uses 4 x AAA batteries (batteries not included) <br />Net weight: 260g <br />Package weight: 265g  <br /><br />Washing note: <br />1. Dry Clean or hand wash only <br />2. Remove EL panel、 battery pack and the whole power cord carefully before washing 3. Do Not submerge any part of the flash panel  <br /><br />Using Notes: <br />1. Insert 2 AA battery only、 don't use mixture batteries <br />2. Slide switch to Operate Power <br />3. Don't bend or apply pressure to the flash panel  <br /><br />Package Contains:  <br />1x LED EL T-Shirt With Music Activated Visual Acoustic Iron Man Style1 Electro-Luminescent Shirt