Mammoth Sales 1 Pair of LED Flashing Light Up Margarita Drink Party Glasses 1 pair of LED Flashing Margarita Drinking Glasses Shades Going to a concert or special event ? These glasses are SURE to make you stand out and be a hit ! 3 modes are available: fast flashing, slow flashing, and constant These Glasses come in Several Colors ! Use the on/off button to change the mode . Batteries are included and installed