Description:Features:Liquid Activated: When drinks are added, it turns off when there is no liquid leftMaterial: Made of clear Polystyrene Polystyrene is non-toxic harmlessDurable: Not as fragile as glass, even not forms sharp fragments when broken Powered by 2*2025 button cells (Included) Ideal for the bars, parties, gatherings, decoration, clubs and other dark occasionsSpecifications:Material:PolystyreneDrinkware Type:MugsSecurity:food safetyPowered by:2*2025 button cells (included)Flashing time: Around 28 hoursApplicable:The LED flashing cup is liquid activated, twinkle when pouring beer,wine,beverage,water,etcSpecifications:Applicable:The LED flashing cup is liquid activated, twinkle when pouring beer,wine,beverage,water,etcPackage Included:1 x Flashing CupNotes:Due to the difference between different monitors, the picture may not reflect the actual color of the item Compare with your detail size, due to manual measurement, allow 1-3cm error If there is a problem with the product, please leave a message before giving bad feedback Thank you for your understanding