"The microwave auditory effect, also known as the microwave hearing effect or the Frey effect, consists of the human perception of audible clicks, or even speec

"The microwave auditory effect, also known as the microwave hearing effect or the Frey effect, consists of the human perception of audible clicks, or even speech, induced by pulsed or modulated radio frequencies. The communications are generated directly inside the human head without the need of any receiving electronic device." https://en.wikipedia.org/wiki/Microwave_auditory_effect https://en.wikipedia.org/wiki/Microwave_auditory_effect