Oura announces new smart ring with updated design and new sensors for $349 CNBCThe Oura Ring 4 has slimmer sensors, increased accuracy, and more sizes The VergeOura Nears $500 Million in Annual Revenue and Readies New Ring BloombergOura Ring 4 debuts slimmer design, additional sizes, and improved sensing starting at $349 TechCrunchThe New Oura Ring 4 Will Be Thinner and More Capable Than Ever WIRED