Morse code, SOS signal transmission:
-
White noise
-
Low frequency pulsing and humming signal
-
Electronic signal
-
Morse code, SOS signal transmission
-
Police radio
-
Low-frequency rumble, high-frequency squeak
-
Electronic signal, energy buildup
-
Radio Setup
-
Morse code, SOS signal reception
-
Radar, location alert
-
High frequency signal
-
High frequency pulsating electronic signal
★★★★★