Our Light-up Tumbler with Straw is very different than your average tumbler or water bottle. Featuring that popular tapered design, this 16 oz. acrylic tumbler comes with double-wall insulation to eliminate sweating and it features LEDS! The red, blue, and green LED lights are activated by an on/off switch in the base that you can set to "constantly on" or "blinking." Students will love the "light show" they get with this Prom gift! In addition to the fancy lights, the Tumbler also comes with a clear lid and straw and your choice of a custom one-color imprint on one side. Customize your Light-up Tumblers for Prom, Homecoming, Winter Formal, or Senior Party swag bags or place settings. The fun and functional Tumblers are especially perfect Prom favors for 1980s themes and/or glow themes! NOTE: Replaceable batteries are included.