ER582S 2 tyre valve covers with built-in LEDs. Durable， high impact， water and rust resistant. Chrome body with ultra bright， long life-span LED lamp. Automatic sensor turns lamp on when wheel is in motion. They are self contained with light & motion sensors， LEDs， and replaceable built-in watch batteries. When it is dark and your wheels start to move， they automatically light up creating a solid disk of light that appears to hover above your wheels. When you stop they will switch off to save battery power. Bring more color to your car. Bring more enjoyment to your drive.   Package Details Weight: 28.89 g Size: 11*7*2 cm Package Includes 2 × Flashing LED Tyre Light 6 × Button Cell Batteries