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A computer mouse consists of an outer shell, which houses internal components like the optical sensor (or LED/laser) and processor for tracking movement, and external buttons and a scroll wheel for user input. The buttons, including the primary left and right-click buttons, and the scroll wheel are used to select items, navigate menus, and scroll through documents. Here's a breakdown of the key components:

External Components:

Shell/Casing: The outer protective covering that holds all the internal parts together.

Buttons: Typically a left and right button for clicking and context menus, respectively. Some mice also include additional buttons for functions like forward/back navigation or DPI adjustment.

Scroll Wheel: A wheel located between the buttons, used for scrolling documents and pages. It often functions as a middle mouse button as well.