• 4-Way Scrolling - Scroll four ways for greater efficiency and comfort with Tilt Wheel Technology.
• Magnifier - Point and click to enlarge and edit details using the Magnifier.
• Battery Life Indicator - You won't get caught with a dead battery—the Battery Status LED Indicator glows red when the battery is running low.
• Revolutionary Ergonomic Design - Soft-touch materials and an ergonomic design fit your hand as naturally as a handshake.
• High Definition Laser Technology - Microsoft® High Definition Laser Mouse products are more precise, more responsive, and deliver smoother tracking
• Instant Viewer - Too many open items on your desktop? Click the scroll wheel button to instantly display your open windows, then point and click to select.
• 6 months battery life - Long battery life helps ensure that you aren’t stuck without your important tools when you need them
• Customizable Buttons - get quick access to the media, programs, and files you use most often with customizable buttons
• Five customizable Buttons - This mouse has five buttons that can be programmed to do a variety of functions.

• Zoom - Get a closer look—zoom in quickly and accurately with the intuitive Zoom feature.
   
• Comfort Curve Design - You spend a lot of time in front of your computer. In fact, the only thing you touch more often than your mouse and keyboard is your pillow. Microsoft offers some of the most comfortable hardware available.
• Improved Number Pad - Commonly used symbols such as equal sign, left and right parentheses and "Backspace" are in quick reach, just above the number pad.
• Internet Hot Keys - With the touch of a button you can quickly access the Internet.
• E-mail and Internet Hot Keys - Touch a button to quickly access e-mail and the Internet.
• "My Favorites" Hot keys - Access the folders, files, and Web pages you use most with one-touch “My Favorites” Keys.
• Integrated Palm Rest - Get better support with this plush, integrated palm rest.
• Cutting-Edge Design - Whether you're at work or play, improve your performance with cutting-edge Microsoft technology.

USB wireless receiver

Laser

For Microsoft Windows-bases computer:

• Windows Vista™, Windows XP Pro/Pro x64 Edition/Home/Media Center Edition/Tablet PC Edition, Windows 2000 with Service Pack 4 (SP4) or later.
• 60 MB free (Install 100 MB)hard disk space
• CD-ROM drive
• USB Port

For Macintosh

• Mac® OS X v10.2x*–10.4x (excluding Mac OS X v10.0–10.1). Exposé™ will only work on Mac OS X v10.3** or later
• 30 MB free (Install 30 MB) hard disk space
• CD-Drive
• USB Port