Features： 1、Wired and wireless models to meet different Cycle needs. 2、Integrated with multiple functions, including instant speed display, maintenance reminder, automatic wake-up, etc. 3、Waterproof design, suitable for all weather conditions. 4、Power-saving mode, automatically enter without Cycle for 300 seconds, extending battery life. 5、Improved sensor, accurate speed measurement with single installation tube. Specification： This bicycle odometer with functions such as instant speed display, maintenance reminder, automatic wake-up, 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 wake-up, etc. Waterproof design, suitable for all weather conditions. Power-saving 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 Odometer Package List： 1*Set Bicycle Odometer