Specification Power: 2 x CR1620 batteries ( Can Be Replaceable ) Material: PCB board + LED lamp + Battery + Double-sided tape + EVA foam Light Color:Color: white light, colorful light (optional) Product Color: Clear Material: Acrylic Product Weight: 40g/pc Endurance: 10 hours Size: 10*10*0.3 cm/3.9"*3.9"*0.1" Light mode: white light: fast flash, slow flash, long light; colorful has only one mode Package including: 3 x LED Coasters Notes: CAUTION:Please note that since the coaster is not waterproof, please do not use it in water 1.We provide clear pictures, measurements where possible. Please check as much as possible to make sure the item is the one that you need. 2.Please allow 0.5-1 inch difference due to manual measurement.(1 inch=2.54cm) 3.The color of the actual items may slightly different from the listing images due to different computer screen, thanks for your understanding. Thank you for understanding. Best gift:LED Cocktail Coaster multi-color lighting, colorful, cool and safe and environmentally friendly, reflecting the romantic and warm atmosphere.Creating a romantic inviting space, optimize scenery and lifestyle, supplying you a romantic, exalted and elegant life. Amazing effect:There are 3 modes to choose from: fast flash, slow flash and always lighting mode. It can satisfy your needs of different occasion, such as party, wedding, cocktail party, dinner party, campfire party and any decoration for party at night. Ultra-High Brightness:Each patch has Ultra-High Brightness LED lights, which can make the clear containers such as wine bottle or wine glass become bright at once. multicolor light is suitable for any container or beverage of different colors. Use beaut light to decorate you bottle and beverage. Durability: Each product is with 2 CR1220 button batteries (installed in the product in advance). The battery can be used over 8 hours, which satisfies your need for the party. You can change battery by yourself to regain its long-time use.CAUTION:Please note that since the coaster is not waterproof, please do not use it in water