YYGIFT(TM) Water Submersible Autobcenter Multi-color Flashing LED Ice Cubes for Decoration Party Supplies / Rocks - 12 Packs Cube 7 colour changing ice cube shaped LED lights. Illuminate automatically when placed in cold liquid. Perfectly for night party, wedding party favors. Made of high quality FDA approved clear acrylic. Filled with freezable jell! 15 to 20 hours battery life, or more. Batteries are not replaceable.