Features: 1Creative Design: This cup is specially designed to be bright when entering water, and the standard packaging is 6 colors. The light will turn off automatically when there is no liquid in the cup. 2Lighting Activities: LED cocktail glasses are great party gifts or decoration, suitable for nightclubs, holiday parties, birthdays, weddings, sports events, festivals, night activities, bars, etc. They will glow. 3Add Interesting Ambience: When you turn off the lights in your room or at a party, these LED light up flashing plastic martini glasses will bring you amazing visual attraction. 4Automatic Switch: Simply add liquid to activate the flashing colored LED light at the bottom of the plastic martini glasses. When the glass is empty, the light will turn off. 5Built in Button Battery: The built in button battery of the LED light up martini glasses can keep bright for more than 24 hours. Package included: 6 x Martini&nbspGlasses 1 x Manual