NWT Oura Ring Generation 3 Heritage in black. Size 9. Sealed in original box. Oura Ring Gen3 allows you to track your sleep, nighttime and daytime biosignals, and daily activity with 15 advanced sensors.  Sensors * Green and red LEDs, in addition to infrared (IR) LEDs. This allows measurements of daytime and activity heart rates * Extra negative temperature coefficient (NTC) sensors to measure differences in your skin temperature. This enables Cycle Insights and improved illness detection * An extra IR sensor, which helps the algorithm detect and compensate for when your ring is not optimally aligned, allowing for more accurate readings * Accelerometers, to detect your daily activity, steps, and common workout types * The Gen3 charger features color-coded LEDs for improved charging status displays Connectivity * Bluetooth Low Energy * EMF-Safe and allows Airplane Mode * FCC certified Other Specifications * Battery: Up to 7 days * Width: 7.9mm * Thickness: ~2.7mm * Weight: 4-6 grams Software * Detailed sleep analysis * 24/7 heart rate tracking * Integration with third-party health and wellness apps like Strava * Advanced temperature monitoring * Blood Oxygen Sensing * Daytime Stress * Dynamic activity goals with Automatic Activity Detection * Heart Health (Cardiovascular Age, Cardio Capacity) * Metabolic Health (Glucose Tracking, Meals) * Oura Labs * Resilience * Women’s Health (Cycle Insights, Pregnancy Insights)