Oura, the Finnish company that has done more than most to put smart rings on the map, is ready to show off its fourth-generation Ring. The new model gets a sleeker design, longer battery life and smarter sensors producing even smarter insights for wearers. But the thing I really care about is that the company has finally made a perfectly-round ring that doesn’t include any ugly-ass etchings on the outside.
The biggest change made to the Ring 4 is in the sensors, which were previously housed in raised bumps
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