1. Increasing the sensitivity of the trackball

2. Adjusting the trackball for accurate movement

3. Removing dirt or debris from the trackball

4. Accurate control and movement with the trackball

5. Moving around the screen with the trackball

6. Changing the display magnification with the trackball

7. Designed for comfortable trackball usage

8. Monitoring the movement of the trackball

9. Pressing the trackball to select or activate

10. Easy to carry and use trackball

11. Internal workings that allow the trackball to function

12. Using the trackball for playing video games

13. Pressing the trackball to confirm or submit

14. Moving the trackball at an angle to control input

15. Moving an object on the screen by holding the trackball

16. Measurement of how fast the trackball moves