The Oura Ring 4 is an advanced health and sleep tracking smart ring featuring breakthrough Smart Sensing technology that continuously monitors over 30 biometrics including sleep stages, heart rate, heart rate variability, blood oxygen levels, body temperature, and activity. This exclusive Costco bundle includes the ring plus two custom charging plinths for convenient charging at home and while traveling.

Built with a fully titanium construction measuring 7.90mm in width and 2.88mm in thickness, the ring features an 18-path multi-wavelength photoplethysmography (PPG) sensor system with red, infrared, and green LEDs that dynamically adjust to deliver accurate continuous data day and night. The Smart Sensing technology provides 120% improvement in blood oxygen signal quality, 31% improvement in nighttime heart rate tracking, and 7% improvement in daytime heart rate accuracy compared to previous generations.

The Oura Ring 4 delivers up to 8 days of battery life on a single charge and fully recharges in 20-80 minutes depending on current battery level. It offers 100-meter water resistance suitable for swimming and sauna use, and operates in temperatures from -10°C to 54°C. The 3D accelerometer monitors movement 24/7, capturing steps, exercise intensity, and nighttime restlessness. Advanced machine-learning algorithms adapt to individual baselines to provide personalized health insights for recovery, stress, illness detection, and menstrual cycle tracking. Compatible with both iOS and Android devices via Bluetooth, with SAR levels 3,000 times lower than typical smartphones. New members receive the first month of Oura Membership free, then $5.99 per month.