[plug] folding bluetooth keyboards for raspberry pi

[M S R Wood]

I'm thinking about getting a folding keyboard, ideally with a touchpad
as well,  to use with the raspberry pi (3B) which I use when
travelling.

Advice on any of the following would be appreciated.
Can anyone recommend  a particular model?
I haven't seen any which specifically mention Linux in the long list
of things they will work with  (e.g.  Mac, Android, iOS, Smartphone,
Laptop, PC Compatible) - will they work with Linux?
Some mention that they have bluetooth 5, I think the pi 3B only has
bluetooth 4 - is this going to be a problem?

Thanks

Margaret