no mouse balls to fish out and clean. Besides all that, there's no distinguishable mouse button. Instead, the entire Apple Pro Mouse is in effect a super-sensitive button - the body pivots up and down to actuate the click mechanism. It even lets you fine-tune the way it clicks, with user-adjustable click tension. The elliptical shape equally accommodates right and left-handed users, and its glass-smooth surface makes it a joy to use.  (less)

mouse balls to fish out and clean. Besides all that, there's no distinguishable mouse button. Instead, the entire Apple Mouse is in effect a super-sensitive button - the body pivots up and down to actuate the click mechanism. The elliptical shape equally accommodates right and left-handed users, and its glass-smooth surface makes it a joy to use. The Apple Mouse uniquely combines simplicity, elegance and precision to deliver a superior mouse experience. It's ideal when working with applications like Photoshop or Illustrator, which require precision cursor movement. It's equally adept on most any surface and maintains accuracy even during rapid movement.  (less)

red underside and taillight, and ergonomic enhancements to provide comfort for left- and right-handed users. Microsoft's IntelliEye optical technology marks a major milestone in the optical mouse category, taking mousing to the next level and giving IntelliMouse Optical unprecedented performance, accuracy and control. Product Description Microsoft IntelliMouse Optical - mouse Packaged Quantity: 3 (specifications are for single item) Device Type: Mouse Connectivity Technology: Wired - PS/2, USB Movement Detection Technology: Optical Features: Scrolling wheel OS Required: Microsoft Windows 95/98, Microsoft Windows 2000, Apple MacOS 8.6 or later, Microsoft Windows Millennium Edition, Microsoft Windows XP Home Edition, Microsoft Windows XP Professional Package Type: OEM ALTERNATE ITEM #: D58-00015 UPC: 0659556604646  (less)