[Easy to Install]: Our mountain bike speedometer accessories are complete and easy to install, you can do it by yourself without any effort [Waterproof Design]: The must instrument you should need for your bike journey, and you'll find it useful. Waterproof- design no need to worry about rain, BUT don't put in the rainstorm or stay in water [Accurate Data]: Pure mechanical bike computer, not only has good quality, but also has accurate data. That is perfect for beginner cyclists looking to take their riding to the next level [Durable Aluminum Alloy]: This is a bicycle or tricycle general mechanical speedometer, it is a high-quality bicycle equipment made of durable aluminum alloy. The bicycle speedo works well to Measure Speed ,Distance, Riding time [Universal Size]: The bicycle speedo works for 26/27.5/28/29 inch bikes only, be sure to check your bike size before you buy it. Small Size ,Light Weight,Wireless &Waterproof design makes it more convenient and durable Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement. Sold by-DIMEANI official store