1.Real-time display of the current speed,trip,trip distance,riding time,trip time,calorie consumption and current time. 2.Easy view of the maximum speed,average speed,total riding distance and rotations per minute of the wheel. 3.Options of 12/24h systems,stopwatch feature and alert feature for bicycle maintenance. 4.Length options of kilometer/mile. 5.Imported sensors to provide stable performance,and accurate speed. 6.Multiple purposes for pbicycles/motor-bicycles(3"-30"). 7.Modern look,Waterproof and protable. 8.Real time indication of acceleration or deceleration for easy control of your speed.