Turn on, turn off the appliance, low-frequency hum: Listen & Download Turn on, turn off the appliance, .mp3 Error! Change your browser, please! ⇓ Download Low Frequency Electric Drone ⚠ Toggle switch, Small switch ⚠ Small electric motor ⚠ Turn off the appliance,, Turn on ⚠ Jacob’s ladder, Electric discharges ⚠ Switch ⚠ Wall switch ⚠ Shoots an electric arc indoors ⚠ Electric sparks ⚠ Movement, Low frequency electric drone ⚠ Tesla coil, Electric discharges ⚠ Button click ⚠ ★★★★★