The LED fluorescent ice with built-in light sensor will automatically illuminate when it touch water or ice, food grade plastic, no chemical, no smell and waterproof. Neon light has two models slow flashing and quick flashing, light can last up to 15-30 hours of battery life, used in Christmas parties, night clubs, bars, karaoke parties, music events, weddings, swimming pool lights, champagne towers and other holiday decorations to build romantic atmosphere.