Ultra-thin Design: The luminous drink coasters are made of laminated foam core with only 0.118 inch self-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 flashing, slow flashing and constant mode. Easy to Use: Just attach these luminous coasters to any ordinary 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 to differ slightly from the real thing. The allowed measurement error is +/- 1-3 cm.