A couple of questions:
1) What reason did the kids have for wearing life monitors?
2) I'm not a fan of Extendar having mystical origins. He looks like a cyborg to me. Anyway, is his being transformed into Extendar by the Sun Stone canon?
1) Melaktha insists on his students/assistants wearing them when they are exploring the extensive and potentially dangerous ruins of Eternia. Since they were in the field, he had them wear the devices and it turned out to be a good thing.
2) The Stone's involvement isn't canon anywhere, but advanced technology often appears like magic to those who don't understand it. Batros being able to manipulate its energies with Nepthu might be a clue about where that could go. I just tend to be a fan of making things sound mystical as much as possible.