This light-up LED mug is made of high-quality, safe, clear acrylic, with replaceable batteries. Heart Shape Sparkling Led Light Magic Cup Mug Suitable for bar, disco, restaurant, holiday, party, friends gifts, etc. To replace the batteries -Open the battery compartment door at the bottom of the base, place the new battery in the battery compartment and screw the battery door. No matter whether you are involved in a disco, bar, or dinner party, or a romantic candlelight dinner. This is to show the glare of colored lights while raising your hands When the drink, glowing light colors also glow, it is a kind of charm and mystique, even a fresh feeling.