Description: Item type: Bike Speedometer Applicable: 26 / 28 / 29 / 27.5 inch bicycles Color: Black Material: Aluminum alloy Bayonet size: About 2 cm Display accuracy: 0.01S Whether it is waterproof: Yes Weight: 345g Package includes: 1 * Bike Speedometer Features: --Accurate Data --High Quality --Practical Use Note: The colors deviation might differ due to different monitor settings, please kindly understand. Please tell us first when you have any problem, we will give you the best service and solve the problem ASAP. Thank you so much.