Battery model: 3*1.5V AG3 button batteries; product size: 2.6*2.6*2.7cm Product material: food grade PS, single LED light, artificial ice particles. Duration: about 8 hours. The product uses light-emitting ice cubes composed of PS materials and electronic components, which has the characteristic of being bright when entering water. (Liquid sensing). There are LED electronics inside the product, no chemical change, harmless, and can be placed in all kinds of drinks to add a romantic and mysterious atmosphere. It is widely used in various festive events or hotel bars and other places. Switch mode: liquid induction, light up when touched by water. How to use: Clean the luminous ice cubes and put them in the water, it will automatically shine; after use, wipe it dry with a cloth and place it in a dry place for next use.