Sound actived el t-shirt 1.100%cotton,180g 2. CE and SGS approved 3.more than 300 ... of panel and a piece of t-shirtT-shirt: 1. 100%cotton, 180g, round collar, short sleeve.2.Main color: black/white ... be carried 4.brightness: 85-150CD/m2 5.No glare, no heat, no radicalization and no pollutation 6.life span: 5,000-10,000hrs ...