This is a meter which should be fixed on the bicycle handle bar and the spoke of rims to count the speed and distance.

There are 13 functions:
1.Display Max speed;
2.Ave speed;
3.Odometer;
4.Distance;
5.Digital Clock;
6.RPM;
7.Tripmeter;
8.Scan the data;
9.Memory;
10Speed Comperator;
11.12/24H Selectable;
12.Speedometer; 
13.Max Ride Time