It is easy to install the LED valve cap on the automobile wheel, which serves as a decorative ornament and provides visibility at night. The LED valve cap adds a stylish touch to your vehicle and enhances nighttime visibility, allowing other drivers to notice the bike from a distance, offering a reflective warning effect. Constructed from PVC, alloy, and LED materials. The product measures 1.7 cm in length and 3.7 cm in height. Suitable for various vehicles including automobiles, cars, buses, trucks, bicycles, and motorcycles. Not compatible with French valves. Item Name: Valve Cap Material: PVC, Alloy, LED Features: Luminous, Tire Accessory, Decorative Battery: 3 x AG10 Button Batteries for Each LED (Included) Size Details: LxH: 1.7 cm x 3.7 cm / 0.67" x 1.46" (Approx.) Notes: Due to lighting and screen setting differences, the item's color may vary slightly from the images. Slight dimensional variations may occur due to manual measurement. 1. When installing, align the positive and negative poles correctly, ensuring the end without text faces the spring. 2. Insert the battery into the black insulating holster inside; do not leave it exposed, as contact with the metal housing may cause a short circuit, leading to rapid discharge, overheating, and battery failure. 3. Handle the lamp head carefully during tightening and ensure the metal strip along the edge makes proper contact with the metal base. If the strip is too close, gently pull it out slightly, taking care not to damage it. 4. If the light does not function under normal conditions, adjust the spring length to ensure full contact with the battery (avoid excessive force to prevent the spring from detaching). If still not working, refer to step 3. Package Includes: 4 x Valve Cap Lights