ITEM NAME:1Pc Solar Energy Auto Flash LED Car Wheel Tire Valve Cap Light Lamp Decor #gib Store Home Promotion Hot Item Add to Fav.Auto start flashing when the car is in motion when car speed up to 25km/h at night. Auto stop flashing when the car is not in motion or when car speed below 25km/h at night. High brightness LED light can avoid accidents when driving at night.