Product Description Bicycle speedometer, bicycle odometer, mountain bike odometer, waterproof mechanical odometer, suitable for bicycles of various sizes including 26-inch, 27.5-inch, and 28-inch. High Quality: Made of high-quality materials, this bicycle speedometer is sturdy, durable, waterproof, and dustproof, suitable for all weather conditions. Easy to Use: Mechanical odometer, no batteries required, easy to use, and accurate measurement. Displays total mileage, single trip mileage, and speed (mph). With Reset Button: The mechanical bicycle odometer is easy to install and features a reset button; simply rotate it to clear the data. Customer Service: We sincerely hope you receive excellent value for your money from this purchase. We firmly believe you will appreciate the quality and performance of our products. If you are not satisfied with the product you receive, please feel free to email us. We will reply immediately and help you resolve the issue. Product Features: Mechanical odometer, no batteries required, easy to use, and accurate measurement. Made of high-quality materials, sturdy, durable, waterproof, and suitable for all weather conditions. Suitable for 26-inch, 27.5-inch, 28-inch, and 29-inch bicycles. Easy to install. Displays total mileage, single trip mileage, and speed (mph). Features a reset button; simply rotate to clear data. Product Specifications: Material: Plastic Color: As shown in the picture Dimensions: Approx. 12*8*5.5 cm / 4.72*3.15*2.16 inches Weight: Approx. 342 grams Package List: 1 x Mechanical Odometer 1 x Connecting Cable 1 x Adapter