To Go Tumblers are quite grand. They fit in your cup holder, or in the palm of your hand. Drinks to go, don't have to be a hassle. Just put them in your tumbler for a colorful no spill thirst master. To activate your Large Double Wall LED To Go Tumbler, press the button underneath. With each push, choose from 7 different steady colors, plus a cool color change function. NOTE: Do not put LED cups in dishwasher. Gently hand wash ONLY & keep moisture away from the base to avoid contact with batteries. "Glasses" are made of high quality acrylic that is FDA approved. Dimensions: Height - 7.25 in. Width (at the brim) - 4 in. Straw - 9 in. long Volume - 18 oz. filled to brim LEDs: Blue Comes ready to use with 3 replaceable AG13 Batteries.