The Oura Ring tracks and analyses sleep duration and quality, as well as heart-rate variability, blood oxygen rate and body temperature. Photo: GluCare
The Oura Ring tracks and analyses sleep duration and quality, as well as heart-rate variability, blood oxygen rate and body temperature. Photo: GluCare

Oura Ring review: Why Kim Kardashian and Gwyneth Paltrow have swapped diamonds for data




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