• PC World
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Microsoft has scrapped the ball and moved on to optics. In place of the rubber tracking ball that appears in conventional pointing devices, the new $75 IntelliMouse Explorer incorporates an optical sensor technology that Microsoft calls IntelliEye. The result: a more accurate pointing device.

The optical mouse uses a digital camera with a lens that focuses light onto the surface beneath it. The camera takes an amazing 1500 shots per second and processes them in order to track movement from picture to picture. By comparing the pictures, the mouse determines exactly where it is going and where it has been, delivering far more precision than conventional mice can.

In testing a near-final version of the Explorer, I was impressed by its ease of installation on either USB or PS/2 ports. Sculpted to fit your right hand (an ambidextrous version is also available), the mouse seems to be a close copy of Logitech's award-winning MouseMan Wheel.

Microsoft didn't quite match the ergonomic comfort of Logitech's device, however. Also, some of the customizable buttons are situated right above the spot where your thumb naturally rests--a convenience, right? But I ended up clicking these buttons inadvertently on more than one occasion--not so convenient.

My score for the Microsoft IntelliMouse Explorer: Technology 10, Comfort 4. Your mileage may vary.

SUMMARY

IntelliMouse Explorer PRO: Optical sensor technology vastly improves precision of pointing and eliminates repair and cleaning hassles of conventional mice. CON: Right-handed device is less comfortable than competing Logitech device; auxiliary button placement can cause data entry errors. VALUE: Revolutionary technology may be upstaged by low comfort. Street price: $75 Microsoft 800/426-9400 www.microsoft.com/mouse