The Sticky Bottom is a self-contained, battery-operated unit that grips the bottom of bottles or glasses. Blue, green, and red LEDs flash, creating a cool light show from a normal water or soda bottle or drink glass. Unlike normal light-up coasters, the Sticky Bottom grips your drink so you can carry it around. This is designed to fit most 20-24 oz. beverage bottles or glasses. Please note it will not properly grip smaller or larger containers. Uses 3 replaceable AG13 batteries (included).