Specification: Name: LED non-slip coaster Material: Premium ABS + Silicone Diameter: 10cm/3.9inch (Please measure the size before purchasing.) Thickness: 4mm/0.1 inch Light Color: White Light/Color Light for Optional Three Mode:Quick Flashing, Slow Flashing and Steady on Package Included: 1 x LED Drinking Coasters LED Round Bar Coaster Size: The drink coasters Diameter 10cm/3.94 inch, each coaster has 6 Ultra-High Brightness LED lights, which can make the clear containers such as wine bottle, glass cup or glass vase become bright at once. Use beautiful light to decorate your bottle and beverage. Daily Waterproof & Transparent :The battery panel were embedded in the LED coasters panel, do not wash directly, clean with wet wet duster cloth. Environmental protection. Made of Acrylic material, light weight and durable. 3 Light Modes,One-Button Operation:press the center button of the product to turn on the power to turn on fast flashing, the second time to turn on the flashing slowly, the third time to turn on, and the fourth time to turn off the power. Easy to Use : Powered by a pair of 2 CR1620 button cell batteries, no tools, and wiring needed, Press the power button for one second to running the LED light. LED atmosphere lights and beverage glass bottle coasters are conveniently and safely used as cup holders or as car interior lights to create a wonderful atmosphere. Multipurpose Drink Coaster : The light up coaster can satisfy your needs of different occasion, such as party, wedding, cocktail party, dinner party, birthday party, etc. Ideal for home, bars, KTV, Restaurant, clubs, etc.