Mesmerizing light-up animated rave clothes and shirts use electro-luminescence and IC chip technology to create a radiant pulsating display- right on your shirt! A small power pack driver sits comfortably in a hidden pocket located inside the shirt which controls the flashing and blinking (requires 4 AAA batteries, not included) on the rave clothes. Absolutely the most amazing thing to make anyone stand out in a crowd. All of our rave clothes and E-Shirt sets come complete with a design panel, a driver unit, and a tee. Most design panels are approximately 2.5"-3.5" wide depending on design. Get extra interchangeable panels for your E-Shirt too! Drivers can be set to multiple selectable patterns! Sound Equalizer EL Shirt, T-Qualizer, Gradient, Shadow Dancers, T-Equalizer Shirts - Be sure to check them all out!