Thanks John.
I thought great!
But the link provided gives the same four sheet 'instructions' as in the packing box.  [VERY basic!]
Plugging the receiver into an USB lights it up, and it ringss when the button is pushed. So now all I need to do is get it set up, as in the distance between the 'bell  push unit' and the receiver.
I actually bought two, as we often are in what used to be our office, and is now a computer room, some 12 mtrs behind our house, in our back yard.
I'll need to do a bit of signage to instruct people!