High frequency pulsating electronic signal:
-
White noise
-
Interference Broadcasting
-
Pink noise
-
Morse code, SOS signal transmission
-
Electronic signal, energy buildup
-
Radar, location alert
-
Morse code, welcome
-
Horrifying throbbing low-frequency rumble
-
Morse code transmission
-
High frequency pulsating electronic signal
-
Geiger counter
-
High frequency squeak
★★★★★