This product has structure of whorl, install it on the valve . The resistance of built-in light, but economize the battery better. Or dark place with turning of wheel , light unreal to is it appear each only faint to take tire have at night, emitting the beautiful brilliant rays, the pet car that give to you adds the pleasant splendor even more. Color is chosen: Red, yellow , blue, green, purple , red and - yellow - blue; Red and - yellow - green; Red and - blue - green, make up seven colors . Features: 1) Screws it onto your tire valve stem 2) It flashs when your car are moving 3) Many LED colors available 4) Decorates your car with fantastic effect 5) Batteries life lasts for 168 hours 6) Suitable for cars, motorcycles, bikes