Morse code, SOS signal transmission: Listen & Download SOS signal transmission, Morse code .mp3 Error! Change your browser, please! ⇓ Download Morse code transmission ⚠ Low frequency electronic signal ⚠ Police radio ⚠ High frequency signal ⚠ Reception, transfer, Morse code ⚠ Location alert, Radar ⚠ Horrifying throbbing low-frequency rumble ⚠ White noise ⚠ Radio Setup ⚠ Interference Broadcasting ⚠ High-frequency squeak, Low-frequency rumble ⚠ Electronic signal ⚠ ★★★★★