LED cup washer,LED coaster,flashing bottle mat,glow bar promotion gift Material:plastic Batteries:2*cr2016 logo available LED cup washer,LED coaster,flashing bottle mat,glow bar promotion giftMaterial:plasticBatteries:2*cr2016logo available led colour can be choosesize:100 mmcontrol by on/off buttonturn on ,then put a beer bottle on it ,is will look very beautiful