... or logos printed on as promotion T-Shirts,different artwork, same price 2.Works with 4 x AAA batteries ... panel is fixed with T-shirt by Velcro, or sew it on T-shirt , when you wash ... el t shirt Washing instructions: 1)Washing clean or hand wash, remove power unit before cleaning2)Do ... dry ready for useEL InverterVotage:6V or 3V Using 2 AA batteries or 4AAA Batteries. Type:Sound active ,5 flashing ...