Turn on, turn off the appliance, low-frequency hum:
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Electric transformer
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Shoots an electric arc indoors
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Movement, Low frequency electric drone
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Electrical discharge surge
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Turn off the appliance,, Turn on
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Electric sparks
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Electric discharges, Tesla coil
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Discharge, Current, electricity
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Small switch, toggle switch
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Low Frequency Electric Drone
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Switch
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Wall switch
★★★★★