ELEDISON&reg; (2-Pack) Sport Bicycle Wheel Light Bulbs 48-Pictures for Bike Wheel Size &gt;24inch, Waterproof, DIY Support RGB colors, 48 LED/Wheel light, 48 pictures. Working by 3pcs normal AAA battery, which will last 30-40hours. Pictures will show out completely when speed &gt;15KM/Hour. The bicycle wheel size should be &gt;24inch (inner diameter &gt;437mm). The package includes 2-Pack bicycle lights, installation accessores and manual, but without battery because it is not allowed for international post shipping.