HELP!! Where is the pairing key on a Microsoft Wireless Keyboard 800?

Question

I am trying to set up a Microsoft Wireless Keyboard 800. The instructions say press and hold the pairing button at the bottom, but I do not see a pairing button? And I cannot find anywhere online that tells me and the instructions it came with do not say.

Answer 1

One or more of these links may be useful:

https://support.microsoft.com/en-us/topic/connecting-a-microsoft-bluetooth-device-523bce0f-750d-b753-7407-c61191e2336b

https://support.microsoft.com/en-us/topic/troubleshoot-problems-with-your-microsoft-mouse-or-keyboard-5afe478d-6402-d72b-93b9-e4235fd5c4cd

https://support.microsoft.com/en-us/windows/fix-bluetooth-problems-in-windows-723e092f-03fa-858b-5c80-131ec3fba75c#WindowsVersion=Windows_11

https://www.wikihow.com/Connect-Wireless-Keyboard-to-PC

https://www.youtube.com/watch?v=t8Rq0XEHne8

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Answer 2

In my case I was asked to replace the Microsoft wireless keyboard because the letters were worn off.

I found (the link no longer has Method 2): LemP

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Replied on February 2, 2014

 How can I pair them in my computer?

You can't.
Most of Microsoft's newer wireless mouse products do not support user "pairing."  I believe that the Mobile Mouse 1000 is one of these.  Confirm by looking at the pictures in the article linked under "Method 2" in Smittychat's post: [http://support.microsoft.com/kb/838398] 
 If your mouse and transceiver do not have the "connect channel" buttons, you can't pair them.
For these products, the mouse and the nano transceiver are matched at the factory.  If the transceiver is lost or broken, the mouse can not be made to work.

https://answers.microsoft.com/en-us/windows/forum/all/wireless-mobile-mouse-1000-pairing-question/bd69f427-8c76-4b1c-bb22-5edb0c7018d1

The only way to get the keyboard or mouse to work is to have the matched transceiver.