Smart rings have been a niche inside a niche in the wearables world for more than a decade. But in the last few years, they’ve enjoyed a renaissance as more attention and hype brought bigger names to the category. Finnish company Oura has been around longer than most and is now the class leader despite fierce competition. At the end of last year, Oura released the Ring 4 to address the flaws of its predecessor and keep ahead of its now many imitators. It’s easy to say that it remains a technological marvel, but
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