Our 12-pack of liquid-activated Royal Blue Liquid-Activated LED Ice Cubes do not have the usual on and off buttons but are liquid-activated. As soon as you place them into the drink of your choice they will light up Blue only and create a fun look for your party theme. Our Blue Liquid-Activated LED Ice Cubes with blue LEDs flash and look great as water decorations in water-based centerpieces, too. Perfect for bars, restaurants, and special events with a blue color scheme. Our Blue Liquid-Activated LED Ice Cubes are reusable and may last up to 12 hours. Sold in a pack of 12 cubes. Please order in increments of 1 pack. Note: Batteries are included & installed but cannot be replaced.