Welcome your guests with the LED Water Glass at your next special event. To activate your LED Water Glass, press the button on the bottom of the base. LED glass glow a constant blue. Never put lighted glass in the dishwasher. Gently hand wash only & keep moisture away from the base to avoid contact with batteries. It is made of high-quality acrylic material that is FDA approved. It has 3 replaceable Batteries which is meant to illuminate your drink and project beautiful patterns.