To activate your LED Winter Snowflake Party Glass, press the button on the base, and press again to power off. Only 1 function on this party cup: fun flashing LEDs. NOTE: Never put lighted glass in the 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 (W x H): 3.35" x 3.54" Volume: 8 oz. filled to brim LED Colors: 3 Blue Comes ready to use with 3 replaceable AG13 Batteries.