ZITRADES 4Pcs Colorful LED Automatic change color Flash Tyre Wheel Valve Cap Light for Car Bike bicycle Motorbicycle Wheel Light Tire Light BY ZITRADES Color : LED Colorful 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