The range on some of these Bluetooth modules is quite impressive too, along with any FM section.
As an example, earlier last year our mode of conveyance failed to proceed & the RAC came to the rescue. Once he was inside the car & I was a good distance away ... I heard him shout 'your phones ringing ...!'
Eh? Is it?, looks at the device, sure enough, it was, so I answered, couldn't here a thing, yet the other half (as I later found out) could her someone muttering about 'that should see them home, rather odd mind you' & the poor chap could hear the other half 'what's broken, who's odd
'
Oh the possibilities these days
Mark