Circular is bringing more finishes, a titanium build, eight days of battery life, and digital sizing to its second-generation smart ring.

Circular has officially announced the Circular Ring 2, its second generation smart ring that includes a new feature that will certainly pique the interest of those that want to keep a closer eye on their heart health.

The Circular Ring Gen 2, which was announced on Jan. 5 just ahead of CES 2025, is one of few smart rings that can detect atrial fibrillation. It's a feature that's become common in smartwatches but is still relatively rare on smart rings.