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.3D dragon design around the cup, fashion and cool.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.Type: LED Glowing CupMaterial: PlasticPattern: DragonPower by: 2 x CR2025 Button Batteries(Included)Occasions: Pub, Club, Party, Cocktail, Halloween, Xmas, Wedding, etcFeatures: Eye Catching, Battery Replaceable, Color Changing, LED FlashingDiameter: 8cm/3.15", Height: 9.5cm/3.74" (Approx.)Notes:Due to the light and screen setting difference, the item& 39;s color may be slightly different from the pictures.Please allow slight dimension difference due to different manual measurement.Package Includes:1 x LED Glowing Cup2 x CR2025 Button Batteries