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When Microsoft's IntelliMouse Explorer appeared last fall (see November 1999 New Products), I praised its groundbreaking optical tracking technology--which replaced the traditional rolling mouse ball--but criticized its righties-only design. Microsoft has fixed that problem and improved overall functionality. The $55 IntelliMouse Optical costs $20 less than the Explorer, seems sturdier, and is ambidextrous.

Like its predecessor, the IntelliMouse Optical has no moving parts. As a result, it can maneuver easily without requiring periodic cleaning or a mouse pad. An eye on the underside captures 1500 images per second of any surface the mouse rests on. The IntelliMouse Optical connects to either a USB port (Windows 98 and later) or a PS/2 port.

The mouse's ingenious scallop shape, with left and right buttons and a middle scroll wheel/button, comfortably accommodates either hand. You can program all five buttons (two on either side of the mouse plus the scroll button) to perform mouse or navigational functions (like double-clicking or moving forward and back). The Optical demands 29MB of hard disk space versus less than 2MB for Logitech's customizable Mouseman+. But most people can spare the space--and this state-of-the-art input device certainly repays the sacrifice.

SUMMARY

IntelliMouse Optical PRO: Ambidextrous, no moving parts, can be used on any surface. CON: Uses 29MB of hard disk space. VALUE: Exceptional comfort and convenience for lefties and righties. List price: $55 Microsoft 800/426-9400 www.microsoft.com/mouse