The new ring model also includes a slightly different internal design, with smaller sensor bumps. This means the two rings of the same nominal size will fit completely differently on the same finger.

Previous generations of Oura rings had three clear plastic bumps for the ... the body of the ring to make it thinner and more wearable. It also comes in a much bigger size range, with sizes ...

Circular's new smart ring, the Ring 2, has an FDA-cleared AFib detection algorithm It can be sized using your smartphone, with no need for a plastic sizing kit Battery life runs for up to eight ...

In a first for smart rings, it also uses an app to calculate your ring size, rather than a plastic kit. The new ring, which is available in Gold, Silver, Rose Gold and Black, is crafted from ...