Usage Tips:Bike Speedometer, Bike Speedometer Bike Computer Mountain Bike Code Table Waterproof Mechanical Odometer For Bikes 26 Inch 27.5 Inch 28Suitable forThe bicycle odometer is suitable for 26 inch, 27.5 inch, 28 inch, 29 inch, sr bicycles to use. The bicycle speedometer is made of good materials. quality, sturdy and durable, waterproof, suitable for all weather. Easy to useMechanical odometer, no battery required, easy to use, accurate measurement. Let you know the total mileage, single mileage, MPH. With Reset ButtonThe mechanical bicycle odometer is easy to install, it comes with a reset button, rotate it to make the clear data. Customer ServiceOur only wish is that you get valuable goods and services from this purchase. And we are absolutely confident that you will love the quality and effectiveness of our product. If you are not satisfied with the product you received, you can email us at any time. We will reply you instantly and help you solve your problem. Features: Mechanical odometer, no batteries required, easy to use, accurate measurement.Made of good quality materials , sturdy and durable, waterproof, suitable for all weather. Suitable for 26 inch, 27.5 inch, 28 inch and 29 inch bicycles. Easy to install.Let you know the total mileage, single mileage, MPH.With a reset button, rotate it to clear the data. Specification: Material: plastic Color: as the picture shows Size: approx. 12*8*5.5cm/4.72*3.15*2.16in Weight: approx. 342g Package list: 1 x mechanical odometer 1 x cable 1 x adapter