The TV ad for this electronic amplifier starts of innocently. "Do you sometimes disturb others while you watch TV?"
Then, it turns creepy.
"Listen to a pin drop from across the room. Or, listen into a conversation from across the street."
Headphones would solve the TV problem. And, if you feel the need to hear pins drop from across the room the only electronics you need might be shock therapy.
Several more references to eavesdropping follow. (scene: a health club) "Ever wonder what people are talking about across the room?" (video)
There oughtabealaw!
There is a law. "Manufacture, distribution, possession, and advertising of wire, oral, or electronic communication intercepting devices prohibited" But, if you are a follower of this Security Scrapbook you know that the law is not being enforced.
This item is not much of a threat in corporate and government circles. However, many of the other eavesdropping devices you read about here are being used.
Moral: It is up to you to protect your privacy.
All we can do is help.