8 ct. pkg- Green Crystal Light Up Ice Cubes have 3 different light capabilities. Click the button located on the bottom of the cube to change the light settings. Set it on a quick double flash of light, a quick strobe like flash or a still light. NOTE: Crystal Cubes are waterproof, will last 8-12 hours if left on continuously and are NOT freezable. Measures 1.5 in and batteries are installed but NOT replacable. This is perfect for any party or event!