https://www.youtube.com/watch?v=ez9c6CrRszU
an amplifier built into headphones, that spit out electronic-waves sounds, for people to walk around and hear them across everyday devices (such as atms, lightbulbs, et-cetera).
https://www.youtube.com/watch?v=ez9c6CrRszU
an amplifier built into headphones, that spit out electronic-waves sounds, for people to walk around and hear them across everyday devices (such as atms, lightbulbs, et-cetera).