Pack of 6 Amazing LED Glowing Cup for Bar and Parties (KB-LED-CUPX6) This is a package of 6 amazing inductive rainbow-color LED light drink cups Light is on when cup is filled with liquid (water, drink, alcohol, etc). Light is off when no liquid is inside cup. The cup is made of safe unbreakable food-container grade acrylic material. It is easily cleaned with water. The cup is powered by replaceable button batteries at bottom of the cup (batteries are included) Buy this pack of 6 cups and have fun with your friends and family at parties and bar