The Oura smart ring is a versatile wearable device that tracks key health metrics. Its tiny sensors measure 20 biometric markers, including heart rate variability, body temperature, breathing regularity, and blood oxygen levels. These measurements are constantly recorded to provide insights into overall health. The ring also calculates stress levels, offering users an objective assessment of their restoration, or relaxation and rejuvenation state. Users have the flexibility to remove and reattach the device at any time, giving them full control over its use.
Source: https://www.washingtonpost.com/opinions/2025/03/14/oura-ring-addiction-health-tracker