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Question: Microsoft identifies the dimensiosn for the model 3000 as 18.4 X 7.8.  Amazon shows 22 X 8.1 which is correct?
Document: I wanted to upgrade from my 2000 series Microsoft Wireless Keyboard and mouse to the 3000 model. This combo works great anywhere you have a USB outlet on your computer or smart television. Covering up to 25 feet. I always shop price, not to be undersold, Amazon was the best deal available.
Microsoft Wireless Desktop 3000 Mouse and Keyboard share the same USB antenna. The Mouse and Keyboard DO NOT have On/Off switches! The ONLY two ways to "shut off" the Mouse: [1] unplug the USB antenna from your computer & attach it ONTO (not into) the bottom of the mouse (correct, you cannot use the keyboard with an unplugged antenna! ), or [2] taking BOTH AA batteries out of the mouse.
I read many reviews on Microsoft wireless keyboard and mouse combination sets and despite some of the complaints I settled on the 3000. I used the Microsoft wireless keyboard and mouse 1000 for 4 1/2 years and loved it. So when I decided to upgrade to another wireless set of course I wanted a Microsoft.The first day after installing the set I starting having intermittent problems with the mouse. Links and tabs would not open when clicked. A few days later the keyboard began stalling as I typed.
I would rate it -1 star if I could. I had this model keyboard for two years and was very happy with it( came with my computer) . I am constantly working on the computer so when it eventually died on me, I wanted one exactly the same. I went to Staples and they did not have the exact model so I ordered it form Amazon.
The print on the keys is very small.Compare this keyboard to the HP Wireless Elite v2 ( http://www.amazon.com/HP-Wireless-Elite-Keyboard-v2/dp/B005HNHRA6/ref=sr_1_2?ie=UTF8&qid;=1355592808&sr;=8-2&keywords;=hp+wireless+elite ). Yes, it's twice the price, but what good is a keyboard that you type lots of errors with.
It works. It always works - Windows XP, 7, 8, 8.1....It is always reliable. It is simple to install. I changed all my systems - all 5 -  to using this combo - including adding docking ststions to my laptops and use it with them when docked.
I had no problem with my standard issue Gateway keyboard and my USB Logitech mouse. The keyboard was nothing special, but the mouse was wonderful. I decided to go wireless for one reason - my 10 1/2 old decided it's entertaining to pull the wire to my keyboard. I decided on this model for several reasons - design quality of the mouse, quiet keyboard, easy set-up, and price. I didn't buy it through Amazon because I didn't want to wait for shipping.
The keyboard also features separate specialty buttons such as email, internet, calculator, etc. It also has &#34;favorites&#34; buttons which can correlate to programs pinned to your Windows 7 (and 8, I think) taskbar. This is very handy for those frequently-used apps to launch them with just 1 button press. Another, often looked-over, feature that this keyboard provides is that it is very easy to clean.
It's excellent software on Windows 7 and XP.OverallBoth are nice products. I would probably recommend the 3000 desktop due to the better wireless range and the lack of the snake-like USB dongle. I don't care for the keyboard and mouse as much as those on the cheaper 1000 set, but I adjusted to them well enough. If you have a place to stash/hide the 1000's dongle and don't need much range, however, I'd recommend saving a few bucks and choosing that model.
I just installed this Desktop 3000 wireless combo today on a Win 7 PC and I am loving it! I rarely come back to Amazon to write reviews, but I made this exception. I just had to find something to type with this extra soft keyboard. Seems like it was designed just for my fingers.The wrist rest is perfect, the keys are soft, quiet and nicely depressed. I just switched over from a Logitech LX710 wireless keyboard/mouse combo and the difference is unbelievable.
Answer: My 3000 is 18.4 x 7.8 (or actually 8 by how I measured). Works great.