Description:100% new brand and high quality The light-emitting principle of this product is RGB (red, green, blue) seven colors, gravity-sensing button illumination, and cyclic flash method.The light transmitting portion is acrylic transparent. Install Power by: 3 x AAA batteries(not included)The principle of illumination, when the cup is placed on the coaster, gravity pushes the bottom button to trigger the power to illuminate. When the cup is removed from the coaster, the power is automatically turned off and the light source is turned off.Imported PE material, green, no black spots, good light transmission, anti-pressure, anti-drop, waterproof, high temperatureSpecifications:Item name: Light flash cup matColor: Black And White,Black And Colorful,White And White,White And ColorfulMaterial: ABSPattern: SolidShape: RoundPower supply:Power by: 3 x AAA batteries(not included)Size: (About)Hight: 2cm;diameter 9.5cmUse steps: Install the battery, put it on the table surface---put the water cup---the coaster shines---take the cup---the coaster is extinguishedPackage includes:1 Pc*Light flash cup matNote:1. Due to the light and screen difference, the item's color may be slightly different from the pictures.2. Please allow 0.5-2 cm differences due to manual measurement.