> PurePulse uses safe LED lights to detect blood volume changes right on the wri... | Hacker News

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		dantiberian on Oct 27, 2014 \| parent \| context \| favorite \| on: Fitbit Charge, Charge HR and Surge > PurePulse uses safe LED lights to detect blood volume changes right on the wrist to deliver heart rate monitoring 24/7. Is there such a thing as an unsafe LED?

wahsd on Oct 27, 2014 [–]

Maybe ones that put out UVA and UVB rays? Just a stab in the dark.

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