[nakkiel]

Did you read the article?

Quote from the article:

"Blood from a patient is drawn through microscopic channels where it then meets chemicals that react with HIV and syphilis antibodies to produce a color change. This can then be picked up by a set of photocells in the dongle, and the results are then sent to an app on the attached smartphone or computer."

[SwellJoe]

Huh...I'd read the earlier article and didn't remember seeing that explanation. I didn't read this variant of the article, as I assumed the one I saw earlier was the more authoritative source, but, perhaps this is just a better article.