Feature: 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