On Wed, 19 Feb 2020 11:10:43 +0000, Tim Lamb
wrote:

I need to buy a set of bluetooth earphones before taking this any
further.

Or buy earphones, headphones etc., nevermind the bluetooth. And these may come
with its own base that gets mains power, and also audio, usually from a
cable-with-plug that goes into a jack on the TV.

NB: if you wear hearing aids, there are "headphones" that don't have
loudspeakers, but an "induction loop", a wire that loops around the neck. This
then feeds into the hearing aid via the "telephone" input, (inductive pickup
rather than the microphone). This makes everything more complicated, but once
set up, it Just Works, and rather better than the microphone.

Thomas Prufer