Just an industrial sounding, 50 Hz Electric Hum. Put simply, this is a noise produced by all large electric contraptions such as transformers, power lines, etc.
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Use in a single end product, free or commercial. The total price includes the item price and a buyer fee.
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Use in an unlimited number of end products, free or commercial. May be used with different clients, but not for on-demand customization products or services. The total price includes the item price and a buyer fee.