Oura Ring Gen 4

Brand new item still sealed in box. Size 9. I have a pair, both brand new, selling two together for 400 euros. Collection in Ballinteer only. Sensors & Tracking:Smart Sensing: An algorithmic sensing platform that improves signal accuracy and adapts as the ring shifts on your finger.Heart Rate: Green and infrared PPG sensors monitor heart rate, heart rate variability (HRV), and respiration 24/7.Blood Oxygen: Red and infrared LEDs measure SpO2 levels while sleeping.Temperature: Digital sensor detects average body temperature variations.Activity: Built-in accelerometer tracks movement, steps, calories, and over 40 distinct activities.Battery & Connectivity:Battery Life: Up to 8 days.Charge Time: Full charge takes between 20 and 80 minutes, depending on the current battery level.Connectivity: Bluetooth Low Energy; EMF-safe with Airplane Mode available.Compatibility: Requires iOS 15.0+ or Android 9.0+ devices.Health & Membership Features:Requires an active Oura Membership to access in-depth analytics, including Readiness, Sleep Staging, Daytime Stress, Cardiovascular Age, VO2 Max (Cardio Capacity), and Women's Health (Cycle, Pregnancy, and Menopause Insights).