Our 12-pack of Blue Liquid-Activated LED Ice Cubes do not have the usual on and off buttons but are liquid activated. So as soon as you place them into a drink of your choice they will light up and create a fun look for any party theme. Our Blue solid on Liquid Activated Ice Cubes look great as water decorations in water-based centerpieces, too. Perfect for bars. restaurants and special events, too at any event with a blue color scheme. Our Blue Liquid Activated LED Ice Cubes come in a pack of 12 cubes. Batteries are included and installed but cannot be replaced.