EL panel attached to the Disco T-Shirt with Velcro, can ... reacts to sound2. Volume Control for the sensitive of music3. EL panel attached to the Disco T-Shirt with Velcro, can ... and replaced4. Hand Washable, just unplug the battery box and EL panel5. Has a sound sensitivity control to take you all ... the T-shirt, 48pcs per carton. Sound and Music Activated EL Disco Dancer EL T-Shirt (4*AAA)