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What are those black rings at the bottom of the headphone's plug? ​

What are those black rings at the bottom of the headphone's plug? ​
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What are those black rings at the bottom of the headphone's plug?
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User DomTomCat
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1 Answer

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non-conductive insulating rings which basically insulate one section from the next in order to represent which components get power
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User Doo Dah
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