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A black smart ring that tracks sleep and blood oxygen (SpO2) and pairs with iPhone and Android phones. It is a screenless tracker, so you wear it on a finger and read everything in the companion app. That makes it a low-fuss alternative to a wrist band for sleep and recovery, but it does less than a smartwatch: no display, no GPS, and no on-wrist controls. Rings in this class are judged on comfort, battery life and app quality, so check those before choosing one over a band.
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Store links may earn us a commission. Price via Klarna.
Lowest price we've seen: $209.99 on Nov 12 at Newegg. Tracked across 1 store since Nov 12.
This smart ring is a fitness tracker worn on the finger. It tracks sleep and measures blood oxygen level (SpO2).
It works with both iPhone and Android smartphones and is designed for fitness use.
