PRE-OWNED, worn a few times, too large for owner I am selling a gently used Gen 3 Oura Ring, size US 13 in Heritage Black. The ring is in perfect shape with no scratches or scrape marks. All data wiped, ready for new user. Code JZ90-51382-13 Tech Specs Materials Durable, biocompatible titanium Non-allergenic Water resistant Weight & Dimensions Width: 7.9mm Thickness: 2.55mm Weight: 4 to 6 grams Power Battery life up to 7 days Connectivity Bluetooth Low-Energy (Bluetooth Smart®) Sensors Green LEDs (optical heart rate sensor) Red LED (blood oxygen sensor) Features Sleep Daily Sleep Score Bedtime Guidance Blood Oxygen (SpO2) Sensing Early Illness Detection Sudden shifts in skin temperature and HRV Personalized Rest and Recovery Insights Activity & Recovery Daily Activity Tracking and Scores Readiness Score Calorie Opt-out Heart Health 24/7 Heart Rate Monitoring Heart Rate Variability (HRV) Women's Health Period Prediction In-Depth Cycle Insights Integration with Natural Cycles Stress Daytime Stress Stress Resilience Integrations Apple Health, Google Health Connect, Strava, Natural Cycles Compatibility Language Availability iOS and Android What's included Oura Ring Ring Charger & USB-C Charging Cable https://ouraring.com/product/rings/heritage/black