Hello, I’m Nathan, and I’ll be assisting you today.
Sorry to hear that you’re having trouble with this but I’ll do my best to help you out, Graham.
I believe you are using the wrong code here,
on the handset, key in Menu#6571, then insert the battery in the key finder.
This is the actual registration step. Following that, you can do Menu#6561 to assign a name to the key finder.
The finder is paired with base, but the process is initiated via the handset, I would have all 3 close together for this process.
Are you sure you're putting the battery in the right direction?
How many handsets do you have with your existing system?
Any other key finders, or range extenders?
Can you open one of the other finders and try to pair it instead, you could have a faulty one here, so I'd like to test another.
Ah yes that does make complete sense, they are indeed different systems. I'm sorry it did not cross my mind that you may have imported them.
Here is the one you need: http://amzn.to/2bE0GY9
If you have any other questions, just let me know. Otherwise, please take a moment to rate my service using the stars at the top of the page; hopefully I have earned 5 Stars. I also invite you to contact me directly with any future support needs at http://bit.ly/1QwLxGh and ask for Nathan.
Thank you, ***** ***** a nice day,
The frequency on these is not one that can be altered, that is a hardware function, not a software setting or firmware function.
The "B" version is not officially listed, but like the range extender should still be compatible with most all 2010 and later models, even if not specifically listed.
If you want to be certain though, the key finder model specifically supported by your system is the KX-TGA20EX model, noting the "EX" suffix. I'm thus far not able to find that specific model sold anywhere though, but panasonic uk site may be able to sell to you direct, but be sure to be specific about wanting the ex model.
Unfortunately I don't have a SM for your particular model, most of what I have access to are the north america models; I've looked through comparable models here that have key finder options, but nothing related to the key finder functionality is even mentioned there, so I do not believe it is something changeable. There is no service documentation published at all for the finders.
You're very welcome, Graham.
You might instead consider a product like "tile" or another bluetooth based finder option that can pair with a smartphone.