Oura, the Finnish company known for pioneering smart rings, has just revealed its fourth-generation Ring. The updated version features a refined design, improved battery life, and upgraded sensors that provide more detailed health insights.

One of the biggest changes in the Ring 4 are the sensors, which now sit flush with the surface, making it smoother and sleeker. The improvements go beyond just aesthetics, with Oura stating that the Ring 4 now has 18 signal pathways, a significant increase from the 8 found in the previous generation.

The company claims that the updated sensors improve blood oxygen data accuracy by 30%, while gaps in nighttime heart rate are reduced by 31%, and daytime gaps are cut by 7%. Although the exact battery capacity hasn’t been revealed, the sensor optimizations should also allow the Ring 4 to last up to eight days on a single charge.

The Ring 4 is available in 12 sizes (4-15) and six colors: Silver, Brushed Silver, Gold, Rose Gold, Stealth, and Black. All options except Stealth are coated in titanium with a physical vapor deposition finish, while Stealth features a diamond-like carbon coating.

The Ring is also water-resistant up to 100 meters, making it suitable for swimming and sauna use, though not for dedicated deep-sea divers.

In addition to hardware upgrades, Oura is rolling out a redesigned mobile app. The app organizes health data into three sections: Today, Vitals, and My Health. These sections help wearers monitor their daily vital signs and long-term health metrics, such as cardiovascular age and sleep patterns. The app update is available for all users, regardless of which generation of Ring they own.

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As with the previous model, Oura continues to offer some features behind a membership paywall, priced at $5.99 per month or $70 per year. New to the Ring 4 are automatic activity and heart-rate detection for up to 40 different activities. The app will also now provide better insights for menstrual tracking, specifically around fertility windows.

The Oura Ring 4 is available for pre-order starting today, with prices beginning at $349. Shipping is expected to start on October 15, 2024.