It's a pretty well-known exploit that the CIA is capable of turning a lot of electronics with speakers into microphones. I imagine there is an entire classified backlog of things they can turn into microphones without the target's knowledge.
The accelerometers that protect the average hard drive are easily subverted for this purpose.
I mean at this point I'm going to assume that any semiconductor device with more than a few pins has an embedded mems microphone.
The CIA…plug a set of regular headphones into a microphone jack, open a recording application and speak into the headphone speaker, you don’t need a 3 letter agency for that physics open secret.
it's not (just) the CIA, it's (just) physics
Tangent but the hidden no-electronics bug "The Thing / Great Seal Bug" really crazy