Multi color flash LED ice cube ,It lights up when it meets a water light. Your clients will be delighted as our LED illuminating drink cubes create colorful cocktails and dazzling drinks at all of your events and occasions. The flash ice cube is made of food grade PS. Batteries are included and installed (but cannot be replaced). The ice cubes do not have the usual on and off buttons but are liquid activated. Cycle through 3 LED functions: Flash, Blink, Steady. Non-replaceable batteries. Complies with ASTM, CPSIA, Prop 65. 1.06" L x 1.06" W x 1.06" H