Dan's Data has posted a comparison between Microsoft's Wireless IntelliMouse Explorer, and
Logitech's Cordless Freedom Optical mouse-and-keyboard set.

The Microsoft product is just a cordless mouse and receiver; the Logitech kit gives you a cordless keyboard as well. They all use radio communication, not infra-red, so you don't have to worry about line of sight issues. They all have sufficient range to work across a lounge or meeting room, though not from the back of a theatre to a slideshow machine on the stage - but for many professional and domestic applications, they'll do. And they all run on ordinary AA batteries. Which are included.

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