Oumers Bike Wheel Lights with 3 LED Flash Modes Waterproof Bicycle Tire Spoke Lights Why Oumers: Oumers INC. mainly engaged in the development and export of outdoor products. Products of high quality, stylish design. Oumers has always adhered to " High quality products, good customer experience" business purposes. Committed to providing you with high-quality products and quality services. Specifications: Material: ABS Plastic + LED. Battery: CR2032 lithium battery (bicycle light battery included). Light modes: Fast flashing, slow flashing and full brightness. Dimension: 5.12 x 1.38x 0.70 inch. Weight: 0.9 oz (each light)A great Christmas present for your children!! Our Oumers wheel Lights set is the perfect bike decorations to increase your visibility, safety and cool factor when you're riding your bike in the dark. Suitable for all kind of the ?2mm spokes bikes.Powered by 1 button batteries of each spoke light (INCLUDED) Warm Prompt: If you receive the item with any problems, please contact us at the first time, you will get the best after-service. We will do our best to help until this is fully resolved. Have a good time!