There are three general types of the mouse: optical, which sense the motion of the mouse on an optical pad; mechanical, such as a touch-sensitive cover over a traditional ball mouse; and trackball. A desktop computer usually comes with a built-in pointing device called a mouse. Touchscreen computers without a touchscreen may come with an external dedicated pointing device or may require the use of the tablet’s fingers.
Belkin makes several body styles from slim to fat for their mice for those who have smaller hands around 3 1/4 inches long, as well as models that work exclusively with Macs.