Key Features Optical Precision and Flexibility

> Optical Get smooth, precise thumb control, along with exceptional comfort and distinctive style. Technology > Ergonomic Design > 2 Extra Buttons > 5 Customisable Buttons > Faster Wheel Scrolling > Precise Thumb Control > USB or PS/2 > PC- or Mac-Compatible

Faster Wheel Scrolling

2 Extra Buttons Microsoft Optical Technology

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Microsoft Optical Technology Now you can experience the benefits of the world's most powerful optical technology. The Microsoft optical sensor replaces your old-fashioned mouse ball. Capturing 2,500 frames per second, it delivers up to four times the performance of other optical mice. This superior tracking speed translates into smooth, accurate cursor performance. You won't need a mouse pad because you can use it on most surfaces.

Ergonomic Design Designed by Microsoft® ergonomics experts, the arched shape provides support in a natural, comfortable position.

Extra Buttons Now you can do even more with your mouse. The two extra buttons let you go Back and Forward in your Internet browser without clicking the toolbar. Or you can reassign them to a command or keystroke you use more frequently.

Customisable Buttons Using the included IntelliPoint mouse software, you can customise the mouse buttons to fit your personal working style. You can reassign all of the buttons - including the wheel button - to perform a command or open a file or Web page. You can even specify different button commands for different programs. Most popular commands are supported - including special Office XP commands. Alternately, you can record a keystroke, such as CTRL P (Print), and assign it to any button.

Faster Wheel Scrolling Simply roll the wheel to move around in documents - no more clicking the on-screen scroll bar repeatedly - saving you time and effort.

Accelerated scrolling reacts to how quickly you roll the wheel, allowing faster movement in Web pages, documents, and other computer programs. This increases scrolling speed on an average of 28 percent (on three or more pages).

Precise Thumb Control Experience accurate, thumb-operated control and smooth, effortless navigation.

USB or PS/2 Plugs into the round PS/2 mouse port on a Windows®-based computer, or the rectangular Universal Serial Bus (USB) port on either a Windows- or Macintosh-based computer.

PC- or Macintosh-Compatible The rectangular Universal Serial Bus (USB) plug connects to a Windows®- or Macintosh-based computer. IntelliPoint mouse software (included) comes in a Windows or Mac OS version.

System Requirements for

The system requirements depend on whether you are using a Windows®- or Macintosh- based PC.

Windows-based PC

To use Microsoft Trackball Optical with the scroll wheel and all customisable buttons, you need:

IntelliPoint software One of the following: 95, Windows 98, Windows Me, Windows NT® 4.0 with Service Pack 5 or later, , or Windows XP Home Edition or Professional operating systems 25 MB of available hard-disk space CD-ROM drive An available PS/2 or Universal Serial Bus (USB) port on your PC (Windows 95 and Windows NT 4.0 operating systems do not support USB) Microsoft 4.01 with Service Pack 2 or later to view Help files (Internet Explorer browser software included; requires 486DX 66 MHz or higher processor, 45 MB of additional hard-disk space, 16 MB of RAM on Windows 95 and Windows 98, and 32 MB of RAM on Windows NT 4.0)

Macintosh-based PC

To use Microsoft Trackball Optical with the scroll wheel and all customisable buttons, you need:

IntelliPoint software for the Macintosh Mac OS 8.6 or 9.x (excluding OS X or later) 15 MB of available hard-disk space CD-ROM drive An available Universal Serial Bus (USB) port