Dynamic LED Functions: Featuring 6 LED lights, our coasters offer a vibrant spectrum of colors, with multi-color and single-color settings. A simple one-second press activates them. Multiple Lighting Modes: Experience a variety of lighting options including flashing, slow flashing, and steady glow. These six distinct modes are easily controlled by an on/off button. Premium Acrylic: Designed for clarity, our coasters are made from high-quality acrylic. They are non-toxic, safe, heat and moisture resistant, recyclable, and easy to maintain. Reliable Waterproof Design: Each coaster uses a replaceable CR1220 battery, lasting up to 10-15 hours（Depends on the flash mode）. Fully sealed and waterproof design ensures uninterrupted use without battery worries. Versatile Uses: Ideal for a range of events from informal gatherings to large weddings, and festive celebrations. Perfect for bars, pubs, KTVs, diners and nightclubs. Battery replacement is easy: simply peel off the sticker on the bottom