Feature:1. Transparent cup with 7 colors, the color of the light is change automatically. Dreamy light, full of style and add lively ambience.2. Can hold liquid, such as water, beer, wine, whisky, vodka, martini, drinkware, coffee, tea, etc.3. Water activated, it glows automatically when drinks are added, turns off when there is no liquid left.4. Perfect for weddings, new year, celebrations,bars, discos, specialty restaurants, and any party.5. Made of high quality acrylic material, environmental protection, nontoxic and durable.Specification:Condition: 100% Brand NewItem Type: LED CupMaterial: AcrylicColor: TransparentSize: Approx.8.6x7.2x7.2cm/3.4x2.8x2.8inWeight: Approx.128g/4.5ozFlash Mode: Water sensingFlash Color: Seven colorsLuminous Duration: About 40 hoursBattery: 2 x CR2025 300mAh(Included)How to use: Simply insert a coin into the battery cover slot and rotate it counterclockwise..Package List:1 x LED CupNote:1. Please allow 1‑2cm error due to manual measurement. Thanks for your understanding.2. Monitors are not calibrated same, item color displayed in photos may be showing slightly different from the real object. Please take the real one as standard.