Description: Amazing effect: RGB Flash colorful led lights, which can make the clear containers such as wine bottle,wine glass,champagne,liquor bottles become bright at once. Bar Accessories:LED Cocktail Coaster multi-color lighting, colorful, cool and safe, romantic and warm lighting. EASY TO USE: Just put cup on the cosater, gravity sensor to click the button to turn on/off, when th cup leaves, the lights auto-off. WIDE APPLICAtion: LED Coaster for drinks, bar, nightclub, wedding, event and party. Decorate your bottle and drinks with the beautiful light. Safe & Durability: Made of premium plastic, It is smooth, steady and will absolutely not affect the normal use of the containers. Note, battery style product is with 3* AAA Batteries, USB style is charge 1hrs for 8-12hrs using. Size Chart: Diameter: 9cm/3.54inch Thickness: 2cm/0.79inch Package Includes: 1 Piece LED Coaster Optional USB or Battery Note: Please note that since the coaster is not waterproof, please do not use it in water.