Features: brand new and high quality Acrylic ultra-thin cocktail light coaster, free wiring, long battery life, safety and leak-free. White has 3 illumination modes (flash/slow/continuous illumination); and colorful light is flashing mode. Back switch button can change mode and color at will. Made of high quality acrylic material, waterproof design, safe and healthy. Perfect for bars, clubs, wedding, dinner party, cocktail parties and more! Durability: Each product is with 2 button batteries (installed in the product). Specifications: Material: Acrylic Coaster Color: Transparent Optional Light Color: White, Colorful Diameter: approx. 10cm/3.94in Power Supply: 2 x button cell batteries(Included) Quantity: 1 pc Package Includes: 1 x Cup Coaster(other accessories demo in the picture is not included.) note: Transition: 1cm=10mm=0.39inch No retail package. Please allow 1-3cm error due to manual measurement. pls make sure you do not mind before you bid. Due to the difference between different monitors, the picture may not reflect the actual color of the item. Thank you!