Designed for professional or casual cyclists. Simple, durable and safe to use. Easily mount and release, few seconds before you are riding. This wheel light is the perfect solution for night cycling when you're on your bike. Quick and easy installation for mountain bikes and bicycles. Features -Color:Multi -Material:Plastic, electronic components -Size:10.00X7.00X1.00cm/3.93X2.75X0.39in -Battery: 1 x AAA battery(not included) - The light is strong enough to be used for a long time without worrying about damage, impact or rain. - Practical designed, and this bike wheel light is very easy to install, saving time and convenient. - With our bike light, your bike is obvious from all angle, and the driver can easily see you in darkness. - Don't need to worry about the bike wheel light will be damaged when riding in rainy days. - Awesome for cycling, riding, creative sports light. A good gift choice for friends. Package list: 1 x bike light