Product Description Features: Intelligent sensing, colorful switching, stop and light up, bright when dark. 3 Modes, Cool and Stunning: Single Color, colorful breathing mode, Single Color breathing mode. 7 Colors: 7 colors, switch as you like, the three-halo design enhances the edge brightness and perspective strength, and perfectly displays the cool light of smart luminous coasters. Material and Feature: Acrylic material, with crystal-like transparency, light transmittance above 92%, soft light, clear vision, acryl board abrasion resistance, good stability, resistance to various chemical corrosion. Waterproof: Waterproof design, high temperature resistance, easy operation, cool atmosphere. Specification: Type:Coasters Coaster Material :Acrylic + LED Size :68mm Installation PositionWater Tank Color Classification:Colorful (can be switched ) Package Included: 2 x Coasters 1 x USB Charging Cable