[PACKING INCLUDE] 30 pcs White Drink Coaster (LED Light Color: White). Each light-up coaster has 2 CR1220 button batteries (pre-installed). Batteries can last over 12 hours. If the light does not work, check if the insulating tab has been removed, adjust battery placement, or contact customer support. Batteries can be replaced by the user. [PREMIUM MATERIAL] Light-up coasters are made of laminated foam core board. The discs are flat, stable, and slightly cushioned. Each coaster features 4 ultra-high brightness LED lights, designed to illuminate clear containers such as wine bottles, wine glasses, champagne bottles, and liquor bottles. [EASY TO OPERATE] Remove the insulating tab, peel off the adhesive backing, and stick the LED coaster onto any standard bottle or drinking glass. Press the ON/OFF button to activate. Three lighting modes available: rapid flash, slow flash, and steady mode. [WIDE APPLICATION] Suitable for various occasions including parties, family gatherings, corporate events, bars, cafes, restaurants, gardens, and outdoor gatherings. [QUALITY SERVICE] LED coasters are ideal for indoor and outdoor beverage service. Color: White Material: EVA Size: 6 cm Package Contents: 30 x LED Coasters Note: Color may vary slightly due to screen settings and lighting conditions. Measurement tolerance: ±1–3 cm.