Features1Wired and wireless models to meet different Cycle needs. 2Integrated with multiple functions, including instant speed display, maintenance reminder, automatic wakeup, etc. 3Waterproof design, suitable for all weather conditions. 4Powersaving mode, automatically enter without Cycle for 300 seconds, extending battery life. 5Improved sensor, accurate speed measurement with single installation tube.SpecificationThis bicycle odometer with functions such as instant speed display, maintenance reminder, automatic wakeup, and waterproof design. It is an ideal choice for Cycle enthusiasts. Features:Wired and wireless models to meet different Cycle needs. Integrated with multiple functions, including instant speed display, maintenance reminder, automatic wakeup, etc. Waterproof design, suitable for all weather conditions. Powersaving mode, automatically enter without Cycle for 300 seconds, extending battery life. Improved sensor, accurate speed measurement with single installation tube. Specifications:Style: Wired Wireless (Optional) Colour: Black White (Optional) Battery: 1*2032 button battery Waterproof : Yes Wired version: Size: 14.0*9.1*2.6cm 5.5*3.6*1.0in Weight: 90.5g 3.2oz Wireless version: Size: 16.3*9.5*5.5cm 6.4*3.7*2.2in Weight: 133g 4.7oz Package list:1*Set Bicycle OdometerPackage List1*Set Bicycle Odometer