Turn on, turn off the appliance, low-frequency hum:
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Low Frequency Electric Drone
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Shutdown,, start up, Electronic energy
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Small electric motor
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Electrical discharge surge
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Low frequency rumble
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Turn on, turn off the appliance,
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Electric transformer
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Button click
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Multichannel switch
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Low frequency electric drone, movement
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Electricity, discharge, Current
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Jacob’s ladder, Electric discharges
★★★★★