Any PM speaker can be used as microphone,and smart tv's are using them as such,listening in on your personal conversations in the area of your television.
Even if you mute the sound,the ability for them to listen is not impeded.
Neither is turning them off.
Unplug them:maybe.
Perhaps a dry-contact relay between the power source and the set,with the set shorted out when powered off.
Same on your telephone.
They can be used in constant monitor mode by anyone with a little tech savvy.
Anyone remember the Clipper Chip?
A very detailed tear-down,including IC's of a new phone might reveal some surprises.
And wireless phones definitely are insecure.
The older rotary dial phones were more secure,having dry contacts for connection,but not much.
An embedded secret microphone is not beyond the realm of imagination.
The way to prevent this is with class action lawsuits and boycotting of ALL of the products that a company makes if they market a tv with the “listen in mode”.
The boycott is more likely to have an immediate effect.
I have already begun my boycott.
The lawyers will profit most from a class action settlement,probably with the company not acknowledging any wrong doing or admission of guilt.
Even though not officially revealed,your telephone conversations are probably being screened for keywords for commercial purposes,as well as for government security agencies.
I have seen too many coincidences for it to be mere coincidence.
You talk with a friend on the phone about needing a certain tool or device,and very soon you get spam with that device or tool featured.
Go buy a bottle of Scotch, pay cash,and that same day you get an email from a substance abuse center.
Cell phone tracking?Vehicle GPS tracking? Facial ID in the store?
Paranoid?Sure I am paranoid,but a certain amount of paranoia is justified and healthy.
I don't mind being paranoid,I just wish I could get a consensus from all the voices.

I am not doing anything illegal, or immoral,although I may sometimes be considered rude,crude,and socially unacceptable,and I do eat some high-fat foods,and I admit,I have removed some of the “Do not remove under penalty of law” tags from mattresses.
I am simply a person who believes that everyone's business is nobody's business,part of a dying generation that shares that respect for the sanctity of personal privacy.
The new generations don't seem to know or care about it.
“I have 1000 friends on * book”.
See how many will get up at 2 am in a thunderstorm and help you fix your broken down car.
Some of those “friends” may see that call for help as their next victim.
I am “over the hump” now,and have much more sand in the bottom of my hourglass than in the top half,and I can see the other side.
In many ways,I am glad not to have to endure what I see coming in future society.
Mankind has always fought.
Sticks and stones,clubs,swords,guns,bombs,nuclear weapons.
“Homo homini lupus est”--Titus Maccius Plautus
IMHO: If the entire human race was eliminated down to one single person,he would walk in front of a mirror and start fighting his own reflection.
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