:The disc is made of laminated foam core flat stable and slightly cushioned.Super bright 4 lights reflect and magnify neatly through transparent container and liquid.Easy to use.Just stick it on any ordinary bottle or water glass and click the button to open it.It can be a beautiful bottle decoration.Suitable for beverage ads bars nightclubs weddings events and parties.Note:1. Due to the difference of light and screen the color of the item may be slightly different from the picture.2. Due to manual measurement please allow 1-2 mm difference.Specification:Product Name: LED Cup StickerMaterial: pcb+led+eva+stickerBattery: 2*CR1220Size: 6cmNumber of lights: 4 lightsLight color: red blue green white colorfulUsage: tear off the back tape stick it on any ordinary bottle or water glass and click the button to open it. includes: Choice 1:1pcs x Coasters(with button battery)Choice 2:10pcs x Coasters(with button battery)"