Not only an LED coaster, this product with 7-color lights can also be used for ambient light in parties, bedrooms, marriage proposals, and more. PREMIUM MATERIAL - Made of high quality acrylic and plastic material, durable and not easy to break. Bottom rubber pad provides excellent slip resistance. UNIVERSAL COMPATIBILITY - This LED coaster has a diameter of 6.8cm/2.7 and is widely compatible with any vehicle with a car cup holder position. SMART SENSOR - With built-in light sensor and vibration sensor, this coaster automatically turns on when it's dark or vibrating, and turns off when it's still for 15 seconds or in bright light. MULTI-COLOR 3 LIGHTING MODES - Employs high-quality LEDs to emit 7-color light to illuminate your car cup holder position. 3 lighting modes are switchable: 7-color mode, breathing mode and gradient mode.Quantity: (1-pack) Car LED Colorful Glowing Water Coaster, 'Other products are not includedColor as shownSize: 68mm (for reference only)Note, because there may be color and size difference between the light effect photo and the actual product, please allow 1-2 cm error