She spoke to the wall, to a hidden microphone, I guessed.

She understood that anything we said would be recorded by hidden microphones.

They talked among themselves, or into hidden microphones in their sleeves.

She appeared to notice that attached to it was a hidden microphone.

It seemed impossible that Carter could have discovered the hidden microphone.

And with sophisticated new cameras available, what's next, hidden microphones?

Koenig considered a moment, but with the hidden microphone in mind, said nothing.

The couple meet in a flowered field, free from hidden microphones.

There, they found a hidden microphone, a wire leading up behind a curtain and through a window to the room above.

As a result, the hidden microphone was not discovered.