"Whereas this is just around your neck and you don't have to think about it."
Unlike the app, the card doesn't track a person's location but instead records the other cards the wearer comes into contact with.
"You're just pinging off other people," Hansen said. "It's not really tracking your whereabouts and so for me I don't even think about it."
Harkness said she's had no technical problems.
"Some people are struggling signing in certain places, whereas this doesn't. It will do its thing when it bumps into another card and then it's downloaded whenever."
Regarding privacy, Harkness said she isn't concerned.
"I think it's a really good thing to do and it makes me feel better because if I was to be infected, it's far easier to track my steps than try and rely on my memory."
All personal data will be destroyed but the learnings from the trial will be used in designing the next steps for New Zealand and contact tracing.
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