How does a laser mouse work?

A laser mouse is a type of optical mouse. It uses a laser beam which is invisible, or nearly invisible, to the human eye. The beam emitted by the laser mouse moves with the user’s hand, triggering an optical sensor system. It works in tandem with a system which tracks how far the mouse has moved by bouncing hundreds of images every second, constantly updating the position of the mouse and the subsequent position of the cursor on the screen.