Electronic signal, energy buildup: Listen & Download Electronic signal, energy buildup .mp3 Error! Change your browser, please! ⇓ Download Electronic signal ⚠ High frequency signal ⚠ High frequency pulsating electronic signal ⚠ Geiger counter ⚠ Morse code transmission ⚠ White noise ⚠ Radio Setup ⚠ High-frequency squeak, Low-frequency rumble ⚠ Energy buildup, Electronic signal ⚠ Low frequency pulsing and humming signal ⚠ Pink noise ⚠ Police radio ⚠ ★★★★★