Liquid Activated Light Up Shooter Glasses have a sleek design perfect for night clubs, bars & parties. These small cylinder LED Cups can be used for party shots of course, beverage taste testers, or send home with your guests as unique party favors! Light Up Shooter Glasses are sure to spruce up any night time event. Simply fill with liquid, and 2 sensors at the bottom of the glass will activate 2 continuous flash funtions: first a slow color change rainbow, then a more rapid flash. Glasses turn off once empty & dry. Light-up glasses are made of food-grade acrylic and not dishwasher safe due to the wiring & batteries; hand wash only. Non-replaceable batteries included.