I greatly enjoy learning about this area of research, so thanks for your insights. There is something very sci-fi about it. My intuition also tells me that "off

I greatly enjoy learning about this area of research, so thanks for your insights. There is something very sci-fi about it. My intuition also tells me that "off" doesn't naturally apply to unpowered devices and that the states are "active" or "asleep". I get the privacy concerns, though we are rapidly entering a world where that doesn't exist at all, so maybe it won't be relevant once these devices exit the lab. The walls have ears, indeed.