SAN FRANCISCO–(BUSINESS WIRE)–ŌURA, maker of the most trusted smart ring, today announced Oura Ring 4. Oura Ring 4 is built around a breakthrough sensing technology, Smart Sensing, which is powered by an algorithm that works with research-grade sensors to dynamically adapt to the finger and deliver accurate and continuous data, day and night. The lightweight, all-titanium design of Oura Ring 4 features recessed sensors for a smooth interior shape and thinner profile, making it more comfortabl