Microsoft Wireless Notebook Optical Mouse 4000 (1-PK) Specification Mfr Part Number: FA2-00002 Feature: High Definition Optical technology: Microsoft High Definition Optical mouse products are more precise, more responsive, and deliver smoother tracking. Magnifier: Point and click to enlarge and edit detail. Tilt Wheel technology: The entire wheel tilts to deliver smooth, accurate performance as you scroll horizontally and vertically through documents and Web pages. Snap-in receiver: Plug in the snap-in receiver when youre ready to work, and then snap it into your mouse to extend battery life when you travel. Six times the battery life: Work longer without interruption. New optical technology helps extend battery life to as much as six times that of competing products. System Requirements: Processor: Pentium 233-MHz or faster processor Memory: 128 MB of RAM Hard Disk: 60 MB (Installation requires 100 MB) of available hard-disk space Drive: CD-ROM drive Operating System: Windows XP Professional, Windows XP Home Edition, Windows XP Media Center Edition, Windows XP Tablet PC Edition, or Windows 2000 Input Device: An available Universal Serial Bus (USB) port Package: OEM