This product is made of Food Grade plastic can be used to enhance displays at home for parties, weddings and other events. These lights will add a sparkle when added to your display vases, jugs and look great in clear wine coolers. The LEDs automatically switch on when placed in water and off again when you take them out! Each one comes with batteries already fitted.they are completely safe to put into any type of beverage to keep your favorite beverage frosty.They will provide many hours of fun and entertainment when used properly..But pls note that do NOT put it in high temperature hot drinks.