The ends of a USB-C to Dell barrel jack adapter.
https://mastodon.sdf.org/system/media_attachments/files/111/621/913/925/221/743/original/b8aff6ef0cb1b7e2.jpeg
Trying out these USB-C adapter cables for older Laptops. So far it works as advertised but now I can use a portable power brick.
This might be the best option for older computers.
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