Electronic signal, energy buildup:
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Low frequency electronic signal
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Low frequency pulsing and humming signal
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Morse code transmission
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Radar, location alert
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Geiger counter
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Pink noise
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Brown noise
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Transfer, Morse code, reception
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Electronic signal, energy buildup
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Interference Broadcasting
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High frequency pulsating electronic signal
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Morse code, SOS signal transmission
★★★★★
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