Colorful LED Automatic change color Flash Tyre Wheel Valve Cap Light for Car Bike bicycle Motorbicycle Wheel Light Tire Light Single Color Wheel Light, Easy to set More energy-efficient,with light & motion sensors Durable, High Impact, Rust Resistant Auto shining No switch, 100% waterproof Please kindly note there is a piece of paper in the battery case that needs to be removed before use. Sometimes it still not work when you remove the paper, then you need to put them on the valve stem and ride, they will light up.