Description: Features: Liquid Activated: When drinks are added, it turns off when there is no liquid left Material: Made of clear Polystyrene. Polystyrene is non-toxic harmless Durable: 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 occasions Specifications: Material:Polystyrene Drinkware Type:Mugs Security:food safety Powered by:2*2025 button cells (included) Flashing time: Around 28 hours Applicable:The LED flashing cup is liquid activated, twinkle when pouring beer,wine,beverage,water,etc Specifications: Applicable:The LED flashing cup is liquid activated, twinkle when pouring beer,wine,beverage,water,etc Package Included: 1 x Flashing Cup Notes: 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.