WIDE RANGE OF USE: Universal for all brands of bicycle computers, can be used as a replacement for broken or lost bicycle computer sensors. EASY TO USE: Suitable for bicycle racks with different radii and easy to install, not easy to lose. Practical: Make cycling more scientific and efficient. Good help for cycling training. EXCELLENT MATERIAL: Made of high-quality materials, it is sturdy and durable and can last a long time. WARRANTY: Regarding this, if you have any problems with this product, you can email us at any time. We will reply to you as soon as possible. The size is measured manually, please allow the error (1-3 cm). Due to different monitor pixels, there may be color differences, please refer to the actual product. If you are dissatisfied after receiving the package, please contact me first, do not just leave negative feedback, thank you and have a nice day.