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

The Oura Ring 4 retains its light titanium build and compact size while improving sensor accuracy with recessed designs for enhanced comfort and reliability.
The asymmetrical placement of the photoplethysmography sensors allows for better signal quality and power efficiency, accommodating the variations in individual finger anatomy.
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