Blue LED light will automatically turn on at night or in weak light environment when it feels vibration. Great addition to your cup and makes great atmophere for your car. Premium acrylic with polished surface, waterproof, heat-resistant, corrosion resistant, anti-scratch for durable and convenient use. Ideal for home or cafe, restaurant table protaction and decoration use. Garneck Car Coasters Car Drink Coaster Coasters for Your Car Cup Holder Coasters Cup Coasters for Car Cupholders for Your Car Solar Led Cup Holder Lights for Car Cup Mat Interior Shine Color: Picture 2 Blue LED light will automatically turn on at night or in weak light environment when it feels vibration. Great addition to your cup and makes great atmophere for your car. Premium acrylic with polished surface, waterproof, heat-resistant, corrosion resistant, anti-scratch for durable and convenient use.