BicycleStore Waterproof Bike Cycling Bicycle Wheel Tyre Tire Valve Cap Light Lamp Led Flash 15 Changes 2-Pack Bundle for 2 Tires (blue) There are 15 kinds of decorative pattern changes.Suitable for polytype mounth,American-style and French-style Water and shock resistant.The external mouth is French-style and you will see the American-style after rotating down It has inductive switch,dual control of vibration and light sense.Lights on need two condition.First,it need dark light,at night or indoor.Second,the bike moves.It will automatic extinguish after 48 seconds when don't move.It won't light on under the sun during the day.You can unscrew the battery cover to extinguish if it lights on when lights are low Bicycle gorgeous tire valve lamp makes you extraordinary when riding at night.This bicycle safety light will help you make your visible on the road in dark Install or remove without any tools only need 2 seconds