The 2pcs Bicycle Bike LED Lights Tire Valve Cap Flashlight is a motion-activated LED light that is perfect for bikes, motorcycles, cars, and trucks. It comes in a pack of two, with each light serving as both a light and a valve connector. Installation is easy and can be done on a wide range of vehicles. These lights not only make your wheels look incredibly beautiful, but they also serve as a safety feature by announcing your presence at night. The LED lights are available in four different colors: blue, green, pink, and yellow. The lights are made of PVC aluminum and are powered by three LR1130 batteries, which are included in the package. The length of each light is 6.1 inches and the diameter is 2.5 cm. Please note that when you receive the lights for the first time, you need to unscrew the back cover and remove the insulation sheet in the middle of the battery or the middle of the battery and the spring to activate the batteries. Also, make sure to install the batteries correctly to avoid any short circuit issues. Please be aware that these lights are activated by vibration, so they will only shine when there is vibration. They will not light up under static conditions. The package includes two wheel tire lights with batteries. Enhance the look of your vehicle and improve your safety on the road with these motion-activated LED lights. Key Features: Motion-activated LED lights for bikes, motorcycles, cars, and trucks Easy installation on a wide range of vehicles Available in blue, green, pink, and yellow Made of PVC aluminum Powered by three LR1130 batteries (included) Length: 6.1 inches, Diameter: 2.5 cm Activated by vibration for safety at night Package includes two wheel tire lights with batteries