Come and see our amazing products. LED waterproof flash cup pad, made of PU, 2.4 inches in diameter.The surface can flash, and there is a button on the back to control the flash. There is a CR1220 button battery on the back of the cup cushion.There are three kinds of lights to choose from: long light, fast light and slow light.The trademark can be printed on the front of the coaster. Pls confirm with us about the packing info, stock color and exact production time before placing your order.