Light Up Coasters: LED coasters have three lighting modes to choose from: fast flash, slow flash and constant light. Easy to Use: Peel off the sticker, stick the light up coaster on the cup, and press the switch below to adjust the light color. NOTE: LED coasters are only suitable for translucent glasses or cups, LED coasters are equipped with a strong adhesive layer to ensure reliable attachment to various surfaces. Multifunctional: LED light up sticker coasters are suitable for birthday parties, weddings, bars and other occasions, use these LED coasters to create a friendly party atmosphere.