Interesting topic for sub-1GHz radio - detection of laptop microphone activity:
https://www.opennet.ru/opennews/art.shtml?num=57767
Idea is (relatively) simple - laptop microphones these days are actually not passive devices on electronic level, so it is possible to detect leak signal when the microphone is activated. So if someone is curious if their microphone is activated, SDR can help to tell that, if trained correctly.
Thouhts? Can this be implemented on flipper?