The IntelliMouse was the first mouse from Microsoft to feature a scroll wheel. The IntelliMouse has a distinctive right-handed ergonomic form.
IntelliMouse with IntelliEye
From the top, identical to the classic IntelliMouse. Features an optical sensor.
Symmetrical ambidextrous design, with two additional side buttons for Back/Forward navigation.
Right-handed design with the Back and Forward buttons placed together on the left-hand side.