Package contents: 25 versatile coasters (LED light color: 5 x red/5 x white/5 x blue/5 x green/5 x multiple). Each light coaster has 2 CR1220 button batteries (installed in the product in advance). Our batteries can last more than 12 hours to meet your needs at the party. Advice: If the light does not work, please try to check whether the insulating part has been removed, or adjust the battery position. Premium Material: Made from laminated foam board, the discs are flat, stable and lightly padded. Each has 4 ultra-high brightness LED lights, which can be used to make transparent containers such as wine bottles, wine glasses, champagne and liquor bottles become equally bright. Different colors can make your party more amazing and they also allow you to quickly identify your cup. Easy to use: remove the insulating film and remove the glue on the surface, stick the LED coaster to any regular bottle or glass and press the ON/OFF button. There are 3 modes to choose from: fast flashing, slow flashing and constant light. Uses: LED round coasters can meet your needs in various occasions, such as parties, dates, family reunions, company annual meetings, KTV, bars, cafes , discos, slow clubs, leisure clubs, clubs, parks, gardens, restaurants, etc. The LED coaster is a must-have for your indoor and outdoor drinking evenings.