This is a pair of motion activated wheel valve stem cap tire LED lights for car. Instead of capping the valve with an ordinary cap, use this light to convert your wheel into a whirling light display. It won’t make your car the Batmobile, but it’s way cooler than simple taillights or radiant stickers. There’s also a case to be made that you’re a Star Wars Jedi Knight with a light saber stowed away in the wheel. You can get these lights in four colors – red, blue, green and yellow. It comes with 3AG10 cell batteries, and saves a lot of energy since it’s motion activated. The screw on cap makes it easy to install, and the light fits into all standard U.S. and European bike wheel valve stems.