Oura Ring 4 vs Oura Ring 3: Is now the time to upgrade?

The Oura Ring 4 is here, bringing a new design and sleep apnea detection. But should you upgrade from the Oura Ring 3? Which should you buy?

​ The Oura Ring 4 is here, bringing a new design and sleep apnea detection. But should you upgrade from the Oura Ring 3? Which should you buy? Digital Trends

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