Oura has introduced a new generation of smart rings - Oura Ring 4. The device has an updated design with a thin titanium body, improved health analysis functions and a larger battery size. The key feature of the new product is an algorithm that has improved the quality of the signal by 120%, improved the accuracy of blood oxygen level tracking by 30% and reduced discrepancies in heart rate readings by 7%. Plus, the ring is now available in sizes 4 to 15 on the US system. It also boasts up to 8 days of battery life. Updates have also been made to the functionality - adding metrics to analyze daily stress, automatic activity detection for 40 sports, and fertile window predictions for those wanting to become parents. The Labs app for Android has also been announced. It consists of 3 sections: “Today”, ‘Vitals’ and ‘My Health’. Oura Ring 4 will go on sale in the U.S. on October 15 for $349