How can i buy an adapter for this?

On amazon, i bought a pair of headphones that were usb-c by mistake. I use iphone and a pc computer, they dont have usb-c plugs. The headphones are usb-c and i am trying to find an adapter that makes usb-c go to a 3.5mm audio jack. I want one where the usb-c side is "open" and the 3.5mm jack side is... show more On amazon, i bought a pair of headphones that were usb-c by mistake. I use iphone and a pc computer, they dont have usb-c plugs. The headphones are usb-c and i am trying to find an adapter that makes usb-c go to a 3.5mm audio jack. I want one where the usb-c side is "open" and the 3.5mm jack side is "closed" (no hole). I don't really know how to explain this, hope somebody understands.
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