Avon Cycles Mechanical Speedometer for Bicycle, Universal Bike Cycling Odometer Waterproof Wired Cyclocomputer

Good bicycle stopwatch provides odometer clock and speedometer function, more useful. Waterproof and anti-shock function can be useful, suitable for most kinds of surroundings. Unique backlight function, convenient and useful. Easy to install and use. Specification: Style: Classic Functions: Speed, mileage