2pcs Colorful LED Automatic Change Color Flash Tyre Wheel Valve Cap Light for Car Bike Bicycle Motorbicycle Wheel Light Tire Light By New New Inc Durable, High Impact, Rust Resistant; Auto shining No switch, 100% waterproof Be Cool: Eye-catching! Play the lead in the dark! Automatic : with light and vibration sensors, automatically light up ONLY when driving, and off when car is not moving Easy to install in seconds: just replace your current valve stem cap with this set of caps and ready to go FREE BATTERIES: 400 hrs long life standard watch batteries operated