On Thursday, the Oura Ring 5 debuted with new AI-driven health monitoring, blood pressure trend tracking, and integrated medical records as the smart ring company pushes deeper into preventive healthcare beyond sleep and fitness tracking. Oura Ring 5 The Oura Ring 5 is 40% smaller than the Oura Ring 4 after a redesign of the ring's sensors, signal architecture, and internal hardware. Engineers rebuilt the ring's mechanical, electrical, optical, battery, and sensing systems to shrink the hardware