Light sensor: The LED fluorescent ice cubes have a built-in light sensor and illuminate automatically in the dark. Automatic illumination: The LED ice cubes light up when they come into contact with water or ice. Safe to use: Powered by battery without any chemical reaction, these ice cubes are safe and reliable. Beautiful lighting effects: Available in multiple LED colors including slow-color-changing, red, white, blue, and pink. Ideal for various occasions: Perfect for use in bars, weddings, parties, and other events to create a romantic atmosphere. Note: Do not swallow. Avoid placing in overly warm drinks. After removing from liquid, dry the surface to stop illumination and conserve battery power. Color: As shown Material: Acrylic Package Contents: 12 x Waterproof LED Ice Cubes Please note: Other items shown in the image are not included. Note: Lighting and display differences may cause slight color variations between the image and the actual item. Measurement may vary by +/- 1-3 cm.