About this project Just add liquid to activate the multi-color LED flashing at the bottom of the cup. The cup was empty and the light went out. After activation, the LED light flashes, changes color, and emits light with a beautiful changing rhythm. The flash cup is made of high-quality environmentally friendly acrylic material. Perfect for parties, bachelor parties, special gatherings, or decorations for Christmas, New Year's Eve, birthdays, weddings, filming, bars, nightclubs, or discos. The sparkling crystal style design and the unique dragon pattern add an interesting atmosphere to your gathering. The LED flashing cup contains four color variations, creating a warm, cool, charming, mysterious, and even fresh feeling during clubs or gatherings with friends. Flashing mode: water sensing. Flashing color: Seven colors. Product size: 8x9.7cm, with a capacity of about 285ml. Battery power supply: built-in button cell battery CR2025, replaceable. Product packaging: Color box packaging. Single weight: 150 grams. Light colors: red, yellow, green, and blue. Product material: Acrylic. Battery power supply: built-in button cell battery, replaceable. Light duration: about 30 hours.