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Oura Ring 4 debuts slimmer design, additional sizes, and improved sensing starting at $349

The Oura Ring 4 is up for preorder starting Thursday and starts shipping October 15. Users get one month of membership to its software offering for free.

All told, the system can collect a few dozen metrics, including more complex data sets like cycle tracking, cardiovascular age, and stress levels. 120% improvement in signal quality for blood oxygen sensing (SpO2), translating to a 30% increase in accuracy in average overnight SpO2 measurement 15% more accurate breathing disturbance index (BDI) thanks to the higher signal fidelity 7% fewer gaps in the daytime heart rate graph 31% fewer gaps in the nighttime heart rate graph The list currently includes meal tracking; Oura recently acquired metabolic health startup Veri, which will ultimately play a role here.

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