The -548B is a portable and multi-functional bike digital LCD computer odometer speedometer, which is mainly made of durable hard plastic material, and can be used to display all information about the current speed, maximum speed, average spped, trip distance, odometer while riding. Besides, it also includes the functions of clock and stopwatch. With waterproof design and easy to install, it is really a wonderful multifunction bike speedometer odometer for choice. Features - Model: -548B. - ColorBlack - 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 13 button battery (not included). - 14 Functions: 1. SPD: Current Speed. 2. ODO: Odometer (Total distance) 3. DST: Trip Distance 4. : Maximum Speed 5. AVS: Average Speed. 6. TM: Elapsed Time. 7. CLK: Clock (12H/24H) 8. Scan 9. "+""-" Comparator. 10. Setting Scale ( / ). 11. Setting Tyre Circumference (0mm-9999mm) 12. Setting the Last Value of Odometer 13. Memory 14. Auto ON/OFF. - Portable and waterproof design, and easy to use. - Note: The Sensing distance of the probe and the magnet head should 1-3mm. Package list: 1 * -548B Waterproof Multi-functional Bike Digital LCD Computer Odometer Speedometer 1 * Sensor 1 * Wheel Magnet 1 * Mouting Shoe 1 * Set of Cable Ties 1 * User Manual