Transcription: Mouse. The mouse is the device that lets you point the cursor to any part of a screen in a graphical operating system like Windows. The main parts of most mice are two little rollers, one on the x-axis and the other on the y-axis. At the base of the mouse there is a ball that comes into contact with these two rollers. When you move the mouse over a surface, the movement of the two rollers is converted into digital information that decides the and rate of movement of the cursor. Now we have optical mice which have a little optical sensor built into the base that sees the movement of the surface ...