... inside of T-shirt. EL T-shirt,sound active el t-shirt,sound activated el t-shirt,el equalizer t-shirt,el flashing t-shirt,sound ... sensor/sensitive el t-shirt,el music t-shirt,music activated el t-shirt,el lighting t-shirt ... pack.Uses 4 x AAA batteries (batteries not included), or DC 6V power supply Size: M,L,XL,XXLNet weight: 254gPackage ...