CES 2025: Circular Ring 2 detects irregular heartbeats in real time

At CES 2025, Circular unveiled its second-generation smart ring, the Circular Ring 2, enhancing the smart ring buying experience with a new phone-based sizing system, which eliminates the need for plastic sizing kits. Available for $380, the device will be on sale in February or March 2025.

“With the Circular Ring 2, we’ve reimagined what a smart ring can be—combining advanced health technology with timeless design and unmatched durability,” stated Cirucular CEO Amaury Kosman in a press release. “This isn’t just a wearable; it’s a statement piece that empowers our users to take control of their wellness without compromising on style.”

The Circular Ring 2 includes several upgraded features such as a longer battery life, improved health tracking, and a titanium build. It boasts a battery life of up to eight days per charge, even with continuous health monitoring, including detailed sleep analysis. The ring is designed with four color options: Gold, Rose Gold, Silver, and Black, and features enhanced sensors for better tracking accuracy, including ECG capabilities.

Notably, the ring utilizes an FDA-cleared atrial fibrillation (AFib) detection algorithm, allowing it to monitor and detect irregular heartbeats. According to Circular, the Ring 2 offers “real-time insights with precision,” enabling users to remain proactive about their health.

Circular introduces the Digital Ring Sizing feature, which allows customers to measure their ring size using a smartphone camera, thereby streamlining the ordering process and reducing waste. Users simply need to place their hand below a card, such as a credit card, for the system to detect the size of their finger. However, initial tests indicate the algorithm may require further refinement, as it inaccurately detected a size 9 for a size 10 finger.

Additionally, the companion app has been redesigned to reflect the ring’s luxurious aesthetic and provide a more intuitive user experience. This app aims to resolve past complaints regarding the usability and data transfer reliability of the previous model, the Circular Ring Slim.

The Circular Ring 2 is positioned as a competitor against existing smart rings like the Oura Ring 4, which costs $349, and offers similar battery life and health tracking features, but without subscription fees.

Featured image credit: Circular