Morse code, SOS signal reception: Listen & Download Morse code, SOS signal reception .mp3 Error! Change your browser, please! ⇓ Download Geiger counter ⚠ Morse code, SOS signal reception ⚠ Morse code, SOS signal transmission ⚠ High frequency pulsating electronic signal ⚠ Morse code transmission ⚠ Radio noise ⚠ White noise ⚠ Electronic signal ⚠ Radio Setup ⚠ Low frequency electronic signal ⚠ Low frequency pulsing and humming signal ⚠ High frequency squeak ⚠ ★★★★★