LED WATER ACTIVATED ICE
Lighted Ice Cubes are molded to appear like ice cubes but are made of sealed acrylic plastic. Water activated! They turn on when they touch liquid and turn off when dry, randomly changes many colors! Light Up Ice Cubes are amazing for any event or party, waterproof and freezable for dropping in drinks, and great for decorations. Get your Drink Lights now
These are cool
These things work great. We throw a handful of them into the pool and the hot tub and everybody loves them. And of course, we put them into drinks for adults and children, who can't get enough of them. They are very bright and turn off quickly when removed from liquid. I don't know if you can change the battery or not.