Turn on, turn off the appliance, low-frequency hum:
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Button click
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Low frequency electric drone, movement
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Wall switch
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Switch
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Electric transformer
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Electrical discharge surge
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Toggle switch, Small switch
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Turn on, turn off the appliance,
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Discharge, electricity, Current
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Tesla coil, Electric discharges
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Shutdown,, Electronic energy, start up
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Electric discharges, Jacob’s ladder
★★★★★