LED Programmable Scrolling Message Badge T-Shirt (Medium) The battery pack can be unplugged for washing the t-shirt. The t-shirt is hand wash only. Requires 4 x AAA Batteries (not included). This shirt includes a 5 x 1 LED dot matrix that can create new, store existing (up to 6 messages) Scroll your chosen message across the screen. Screen is slim with no loose wires or bulky controls and user manual and battery are included.