Specifications: This cup is environmental protection transparent shine cup, when pour into liquid (water, juice, beverage, beer, etc), it will light up and flash immediately, very magical. Suitable for celebrate, party, bars, gifts and so on. Auto change led color after fill in water or beer. Water activated: it glows automatically when drinks are added liquid, and it will turns off when there is no liquid left. Enjoy different drinking moment with this vivid mug. Item Name: LED Flashing Cup Material: Acrylic Capacity: 400-500ml Light Color: Red, Yellow, Green, Blue Changing Power by: 2 x CR2025 Button Batteries (Included) Occasions: Pub, Club, Party, Cocktail, Halloween, Xmas, Wedding, etc Features: Eye Catching, Battery Replaceable, Color Changing, LED Flashing Size: 16.5cm x 11.5cm x 9cm/6.50" x 4.53" x 3.54" (Approx.) Notes: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement. Package Includes: 1 x LED Flashing Cup