b' The SUNDING SD-548B is a portable and multi-functional bike digital LCD computer odometer speedometer, which maximum speed, average spped, trip distance, odometer while riding. Besides, it also includes the functions of clock Features - Model: SUNDING SD-548B. - Color: as shown in the pictures. - Shell Material: durable hard plastic. - Size: about 46mm*45mm*19mm. - and Waterproof Multi-functional Bike Digital LCD Computer Odometer Speedometer. - It is functioned as tracking your training progress in real time. - Easy installation, durability. - Powered by one 1.5V AG13 button battery (not included). - 14 Functions: 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 (12H/24H) 8. Scan 9. +- Comparator. 10. Setting Scale (KM/M). 11. Setting Tyre Circumference (0mm-9999mm) 12. Setting the Last Value of Odometer 13. Freeze Frame Memory 14. Auto ON/OFF. - Note: The Sensing distance of the probe and the magnet head should be keep 1-3mm. '