Brand: Oura Model: Oura Ring 4 (Latest Generation) Size: 11 Color: Silver (Classic Shiny Finish) Condition: Brand New / Factory Sealed in Box Product Features: Fully updated sleek, all-titanium interior and exterior profile for comfortable all-day wear. Advanced Smart Sensing technology delivers accurate biometrics. Tracks deep sleep quality, sleep stages, overnight heart rate variability (HRV), and blood oxygen levels. Full daytime fitness metrics including automatic activity detection, step counter, and stress tracking. Impressive battery life scaling up to 8 days on a single seamless charge. Complete cross-platform compatibility with both Android and iOS mobile devices. Fully water-resistant design up to 100 meters, making it safe for swimming or showering