The function of it is a coaster. When an ice bucket is placed on top of it,The light from the coaster will shineinto the bucket. Plastic coaster with lightIt should be operated with a AAA Battery. The preferred material for The coasteris plastic or acrylic.Size:30(Dia)X1.5(Thickness)cm,1pc/polybag, 120pcs/ctn,Ctn meas: 54X33X23cm(0.0410CBM), Plastic coaster with light