The fabulous bike wheel light with 21 different kinds of patterns is a colorful and wonderful bike decoration for you, especailly its gives you a very cool riding experience. IP55 waterproof function allows you to take a ride at any time. Feature - ColorBlack - Material: Plastic. - Size: 15.00X9.20X1.50cm/5.89X3.62X0.59in - Quantity of LED: 32. - of wheel diameter: 20in and above - Requirement of speed: 20km/h and above - and . - Waterproof grade IPX5. - mode: Manual and felt induction - Pattern is clear and complete when is up to 20km/h. - Fix on spokes of bike with three rotary bolts. - Powered by three AAA batteries (not included). - Water resistant design, can be used in rain. - Easy installation and quick release. - Note: The wheel light can be used in rain but can not be soaked in the water. - Multi-color lights: cool decoration gives you wonderful and cool riding experience. - Premium Plastic material: assures your safety and when riding. - Easy To Install: do not need any other tools but several seconds to install on your bike. - IP55 waterproof grade: do not worry about the water or rainy day, just take a ride with it at any time. Package list: 1 x Bike Spoke Light