Plastic 150ml Wine Champagne Flute Glasses Wine Champagne Light Up Flashing Cups Liquid Activated Glasses for Wedding, Party, Birthday, Festivals. When the liquid is poured in, the LED cup will light up, and when the liquid is poured out, the LED cup light will go out. Each light up cup includes 2*CR 1220 button battery, When the lights of the cups are flashing at the same time, it creates a beautiful and charming effect.