Features: 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. Suitable for 26in, 27.5in, 28in, 29in bikes. Easy to install. Let you know the total mileage, single mileage, MPH. With a reset knob, swivel it to make the data clearing. 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 AdapterMechanical odometer, no battery requires, easy to use, precise measurement. With a reset knob, swivel it to make the data clearing. Let you know the total mileage, single mileage, MPH. Made of good quality materials, sturdy and durable, waterproof, suitable for all weathers to use. Suitable for 26in, 27.5in, 28in, 29in bikes. Easy to install.Item Weight: 342 Grams. Item Dimensions LxWxH: 4.72 x 3.15 x 2.36 inches. Brand: DAUERHAFT. Date First Available: December 25, 2020. Best Sellers Rank: #262,094 in Sports & Outdoors. Customer Reviews: 3.4 out of 5 stars 25 ratings 3.4 out of 5 stars. : B08RBC3RRC. Part Number: ?DAUERHAFTqkz5i2d9w4. Manufacturer: ?DAUERHAFT. Brand Name: ?DAUERHAFT. Item Weight: ?342 Grams. Item Dimensions LxWxH: ?4.72 x 3.15 x 2.36 inches. Package Weight: ?0.44 Kilograms. Item Package Dimensions L x W x H: ?4.13 x 3.74 x 3.23 inches.