Microsoft Wireless Desktop 850 Optical Keyboard & Mouse Combo (PY9-00002) - Black - English

  • Model #: PY9-00002
  • Web Code: 10394687
Sold and shipped by: Best Buy
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Enjoy the freedom and convenience of wireless technology with this Microsoft desktop keyboard and mouse combo. You can roam up to 15 feet away with a strong signal. Or, you can take the mouse separately to use with a laptop while traveling -- the tiny transceiver conveniently snaps into the bottom of the mouse when it’s time to pack up and go.

More Information

  • Advanced Encryption Standard (AES), which protects your personal and business information by encoding your keystrokes
  • 2.4GHz wireless delivers a reliable connection with up to a 15-foot range
  • Windows shortcut keys provide easy access to commonly used functions
  • Media keys for music and video control
  • Design is suitable for use with either hand
  • Optical Technology 1000 dpi provides responsive cursor control
  • Snap-in transceiver stows conveniently under the mouse
  • LED optical tracking technology

What's in the Box?

  • Microsoft Wireless Optical Keyboard
  • Microsoft Mouse
  • 3 x Batteries


  • Parts - 3 Year(s)
  • Labour - 3 Year(s)

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  • Mouse Features
  • Connectivity Type
  • Connectivity
  • Tracking Technology
    LED Optical Technology
  • Bluetooth
  • Track on Carpet
  • Track on Glass
  • Scroll Wheel
  • Contour Design
  • Number of Mouse Buttons (Inc. Scroll Wheel)
  • Mouse Cord Length or Cordless Range
    15 ft
  • Mouse Colour
  • Adjustable Weight
  • Built-in Wireless Receiver Compartment
  • Nano Wireless Receiver
  • Gesture Support
  • Maximum Sensor DPI
    3000 dpi
  • Rechargeable
  • Battery Life Indicator
  • Approximate Battery Life
    Keyboard - 15 Months; Mouse - 8 Months
  • Batteries Included
  • Designed For Gaming
  • Keyboard Features
  • Keyboard Language
  • Keyboard Cord Length or Cordless Range
    15 ft
  • Ergonomic Design
  • Built-in Trackpad/Touchpad
  • Backlit Keys
  • Mechanical Keys
  • Keyboard Colour
  • LCD Display
  • Solar Powered
  • Designed for Gaming
  • Wrist Rest Included
  • Compatibility
    Windows; Mac
  • System Requirements
    Windows 10; Windows 8; Windows 7; Mac OS X v10.4-10.7
  • What's in the Box
  • Warranty Labour
    3 Year(s)
  • Warranty Parts
    3 Year(s)



Customer Reviews

3.1 / 5
Based on 15 review(s) More about Customer Reviews

Ratings in Detail

  • 5
  • 4
  • 3
  • 2
  • 1

Positive vs. Critical Reviews

Positive 53%

8 Reviews

Critical 46%

7 Reviews

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  • from Mississauga, ON

Keys freeze often, mouse pointer moves uncontrollably

I bought this product last week at Best Buy Heartland. I am disappointed. I am satisfied with the appearance and feel of the product. However, the key often freeze or fail to respond. The mouse pointed runs across the screen without any control, jumps or select options that I am not pointing at. It is a real inconvenience when I am rushing to type lengthy documents or browsing online in a rush. I cant return the product because I disposed of the box.

  • from St. John's, NL

Solid Basic Wireless Keyboard and Mouse

This is a great buy if you are looking for a solid basic wireless keyboard and mouse. There are very few bells and whistles but I actually prefer not having a bunch of keys I never use. Excellent deal, especially on sale.

  • from VICTORIA

Keyboard works well. Mouse is awful.

The keyboard in this combo works great. Easy to type on and good layout of the keys. Hasn't needed new batteries yet after 8 months of ownership. The mouse on the other hand is awful. Very jumpy, scroll wheel works when it wants to, and the tracking is bad.

  • from Kitchener, ON

You can't replace the dongle

Look elsewhere. Nothing wrong with the keyboard mouse but the dongle is not replaceable and is easily broken or lost.

  • from Surrey, BC

better than I expected

this keyboard works fine. the keys are nice, good travel. Mouse is comfortable. receiver / keyboard pair is encrypted, so it makes sense the receive is not replaceable, there is a nice little holder on the bottom of the mouse for the receiver so you don't lose it. When on sale this is a steal.

  • from Edmonton, AB

Great and Secure

It's secure and this is the first advantage. I mean its wireless connection unlike many other wireless keyboards is encrypted. (it is harder for hackers to steal your passwords and etc.) It really looks nice. Both keyboard and mouse. It works pretty well. Some guy had complained that there is no caps lock indicator on this keyboard. I should tell that all of wireless keyboards to save battery consumption do not present such LED indicators. The left key in (my) mouse makes sound louder than the right key. However, it is not that annoying but I'd prefer it to be more quiet. I bought this keyboard and mouse in labor day and I believe it's definitely worth its price.

  • from Mississauga, ON

Key pauses or sleeps

Disappointed in this product. I press a key and it doesn't respond. It can be any key at different times. No rhyme or reason. Sometimes there just isn't a response. I had a Logitech before this but alas after years of use it decided to no longer work. I think I will return to Logitech.

  • from Waterloo, ON

Malfunction After 60days

Some keys are not functioning after 60 days when I purchased the item. I couldn't return it because it is out of the range of return policy, very disappointed

  • from London, ON

Disappointing keyboard and mouse purchase

I bought this set because it was on sale and my old set had gotten a little ugly so I figured I was safe with a MS branded unit...I was a little disappointed to find the unit was clearly used or refurbished. There are a lot of marks on the high gloss finish and the bottom of the mouse has had the "feet" scraped (as in to clean it off). That and it had one battery in it already. The CTRL key on the right side seems very connected to the directional key beside it. When scrolling with the mouse, the screen rolls up and down one frame (or part frame?) quickly a couple times after you have stopped moving the mouse. The left mouse button is pretty stiff. It did set up easily, the keyboard is slightly smaller than my old one, but maybe they all are now, my last one was at least 10 years old. That said, I do not feel like I upgraded much from it with this purchase, even at the sale price. I guess seeing it in store I would have avoided getting the ugly duckling, assuming mine was the only one on sale that had issues of course, sales anymore seem to all be based on something being wrong with a product. It came very quickly. It is just cheap enough I don't feel I want to waste the time returning it but if it was an easy thing to do, I would most likely be doing just that.

  • from Cambridge, ON

keyboard and mouse

Works very good, no problems so far. Would buy another in a heart beat..

  • from Victoria, BC

Working great so far!

I haven't had any of the problems so far that the other reviewer did. It was really easy to set up - so easy I thought I must be doing something wrong - but no, just pop in the USB and batteries and you are done. I won't be taking the USB in and out, so I think the risk of damaging it is low. The keyboard is comfortable, quite adjustable in terms of angle, and narrow, which is important to me as I am using it on a small desk. The mouse works well too. I'm very pleased with this product and also with the speed with which it arrived. I had a problem and this solved it quickly. I'm giving it a 4 only because I can see that what the other reviewer pointed out could be a real problem, but so far (just two weeks) no problems.

  • from Winnipeg, MB

Very good but a failure

A good keyboard and mouse in all respects. Except if the USB receiver is lost or broken then the entire set is useless. Judging by its size it will be lost or broken. Microsoft does not offer replacement receivers. They are programmed specifically to the keyboard and mouse it came with.Very disappointing to read about this on Microsoft help pages. I was expecting MS to be better than this. What a waste of money and e-waste of perfectly good equipment. Don't buy it until Microsoft changes this flaw. I believe Logitech offers universal receivers that can be replaced very easily.

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