Firefly 5 pack LED Light Colorful Flashing Beer Mug Coke-Cola Juice Drink Cup For Party, Nightclub,Bar Decorative (Large) Simple push-button on/off mode selection switch. Made of high quality clear acrylic, it's very safe to be a cup for drinking Comes with 3 LR44 (AG13, L1154) button-cell batteries preinstalled. Light-up mode: Multi-color fast flshing; slow flashing; steady on. It will send a charming converted colorful light. Suitable for cafes, bars, night beer, karaoke OK, family dinner and other occasions. Size: cup diameter 7.8 cm; Bottom diameter: 5.3cm; Height: 15 cm