Have you ever calculated how fast you can drive or how long you drive everyday? May be you want to calculate but you do not have such kind of tool and the traditional watch is not so accurate. If so you should pay special attention to this genuine Sundingf Waterproof bike computer. This cycle computer is so powerful in its functions. It can calculate the current speed the maximum speed the average speed and so on. - Easy installation all necessary mounts are included - Digital LCD display shows current time while standing by - Water resistent design (can be used while raining) - Powered by 1*CR2023 battery (included); Sensor pack powered by 1*23A 12V battery (included) - Measures and shows the following information: 1. SPD - Current Speed - 2. ODO - Odometer (total distance) - 3. DST - Trip Distance - 4. MXS - Maximum Speed - 5. AVS - Average Speed - 6. TM - Elapsed Time - 7. CLK - Clock (12/24H) - 8. Scan "+" "-" comparator - 9. Speed comparator 10. Setting speed scale (km/hm/h) - 11. Setting tire circumference (0mm~9999mm) - 12. Setting the last value of odometer - 13. Auto On/Off - 14. Freeze frame memory