Microsoft Intellimouse 3.0 PS2/SER Button

The IntelliMouse combines the scroll wheel with award-winning ergonomic design. By streamlining navigational tasks such as scrolling in Web pages and documents, Microsoft IntelliMouse sets an advanced standard for pointing devices. Save time and steps. Simply roll the wheel forward or backward instead of clicking on a scroll bar or arrow. Work hands-free with AutoScroll. Press the wheel, set the scroll speed, then watch your document scroll automatically. Use the wheel to see either close-up or big-picture views without having to use menus or toolbars (in compatible applications). IntelliMouse is designed to be comfortable. Its raised back fits the palm of your hand, and its side is curved so it's easy to hold - whether you're right-handed or left-handed.