Ultra-thin Design: The luminous drink coasters are made of laminated foam core with only 0.118 inch adhesive layer. The disc is flat, lightweight and stable and never affects the normal use of the container. 24+ Hours: Each bottle coaster comes with 2*CR2020 batteries (included and installed), which work for 24+ hours and can be used in bars, home bars, wedding centers, various parties, glasses, liquor shelf, vase, bottles and night disc golf. 3 Flashing Modes: The bright coasters for drinks have 4 super bright LED lights and 3 flashing modes, fast flash, slow flash and constant mode. Easy to Use: Just attach these luminous coasters to any normal bottle or drinking glass and click the button to turn on. Light color: blueColor: WhiteMaterial: EVA Size: 6cmPackage contents:12 x Sticker lightsOnly the above package content, other products are not included.Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The allowed measurement error is +/- 1-3 cm.