Funny Automatically Shining Cup --- with a colorful LED light built inside the bottom, the cool glasses will automatically give out colorful light in a beautiful rhythm of change when you pour water inside, and the light will also automatically go out when the cup is empty. Drinking with them will bring much fun to you. Leave You Unforgettable Memories --- the birthday glass is practical to apply on various kinds of occasions, such as Christmas, New Year's Eve, birthday, bar, nightclub or disco, weddings, sporting events, festivals, night events, brightening up your party decorations, creating an unforgettable and warm atmosphere Note --- This Liquid Activated Glowing Whisky Tumbler has 2 built-in replaceable CR2025 button cell batteries. Note: Not suitable for boiling water above 60 degrees directly poured into the. Sturdy and Reliable --- the fun glasses are featured with the elegant and delicate cut surfaces that can present the shiny colorful lights better when there is water inside them; Made of quality PC material, they are sturdy to resist deform, break, lightweight to hold, reliable to apply, easy to clean, clear and transparent Suitable Capacity --- the neon glasses are about Top diameter 8.5cm, height 9cm, bottom diameter 8cm, with a suitable capacity of about 280ml, ideal for holding wine, milk, water, or other beverages