We’ve reviewed our fair share of smart wearables here at GSMArena but the ring form factor has evaded us until now. Ultrahuman is a young company aiming to establish itself in the smart ring market and Ring Air is its latest product. This is the lightest smart ring on the market and it promises to deliver the health and activity tracking you'd normally get in a smartwatch but in a form factor that's far less obtrusive, while still offering multi-day battery life. Fitting most of the sensors from a smartwatch inside a ring with a diameter of just 8.1mm is an impressive engineering...

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