1,The wheel is the shiftable speed button,eachpress on the wheel multiplies triple. Example:in excal,default status inwingdows is 3 rows.

                                                                                                                                                                        1-1. press the wheel once, next scroling number of rows: default 3 rows*3=9 rows. 

1-2. press the wheel once again. next scrolling number of rows: 9 rows*3=27 rows.  

1-3. continue to press the wheel.  next scrolling number of rows: 27 rows*3=81 rows.                                                           

1-4. After pressing the wheel fourthly,it will turn to default value in windows.

2,The "DPI Shift Button” with color indication instantly shifts mouse sensitivity for 400-800-1600-2000 DPI. (No Driver Needed!).And gives you quick access without pausing the action.

3,Intelligent 4th and 5th Buttons-Forward and Backward 

4,The fashing wheel with led light.

5,"the ENTER key" instead of keyboard "ENTER".and no move your hand to keyboard push the "enter" in office.