Oura Ring 4 in Black (Size 13) w/ original Charging Dock and USB-C Cable.

Oura Ring 4 in Black (Size 13) w/ original Charging Dock and USB-C Cable. This was only used for a couple of months, since my boyfriend just couldn't get used to wearing a ring. Works perfectly! Comes complete with its official silver charging dock and USB-C cable. Fully tested, cleaned, and ready to pair with a new Oura account. Model: Oura Ring 4 Color: Black Size: 13 Condition: Great pre-owned condition with light cosmetic wear from normal daily use (see photos). Includes: Oura Ring 4 (Size 13), Size 13 Charging Dock, USB-C Cable. Key Features: *Smart Sensing Technology: Upgraded algorithm and sensor recessed design that adapts to your finger for continuous, more accurate data collection. *All-Day & Night Health Tracking: Monitors 24/7 heart rate, Heart Rate Variability (HRV), daily Readiness scores, and daytime stress levels. *Advanced Sleep Analysis: Tracks sleep stages (Deep, Light, REM), restful sleep quality, and oxygen (SpO2) sensing. *Full Titanium Design: Sleek, fully recessed interior sensors for increased comfort compared to older generations. *Activity & Fitness Tracking: Automatically detects workouts and daily movement, syncing seamlessly with Apple Health, Google Health Connect, and Strava. *Extended Battery Life: Up to 8 days of battery life on a single charge. *Water Resistant: Rated water-resistant up to 100 meters (328 ft).