SO i was born in south america, and we have many many crickets which are constantly buzzing. i left south america and ended up in an insectless land and i can still hear the ringing. its very high pitched and if i listen i can hear it in high noise situations and when its quiet its more present. I can also hear electricity running through wires. I can find where wires are located in my walls by putting my ear up to it and listening. I can hear most general electronics if i try. Smartphones are pretty hard. Computers are easy and most TV's are easy unless they are very small. The sound of the constant buzzing is different from the electronics. i can tell when its one or the other.