High frequency squeak:
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High frequency pulsating electronic signal
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High-frequency squeak, Low-frequency rumble
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Geiger counter
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Horrifying throbbing low-frequency rumble
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Low frequency electronic signal
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Radio noise
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Police radio
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Electronic signal, energy buildup
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Radar, location alert
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Transfer, Morse code, reception
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SOS signal reception, Morse code
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White noise
★★★★★