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Features: Suitable for 26in, 27.5in, 28in, 29in bikes. With a reset knob, swivel it to make the data clearing. Easy to install.Let you know the total mileage, single mileage, MPH. Mechanical odometer, no battery requires, easy to use, precise measurement. Made of good quality materials, sturdy and durable, waterproof, suitable for all weathers to use. Specification: Material: Plastic Color: as picture shown 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