The Oura Ring 4 is an advanced health and sleep tracking smart ring featuring a fully titanium design with recessed sensors for maximum comfort during daily wear. This Costco-exclusive bundle includes the ring plus two chargers for added convenience.

The ring utilizes Smart Sensing technology with an 18-path multi-wavelength photoplethysmography (PPG) sensor system that adapts to your unique finger structure and skin tone to deliver accurate, continuous biometric data day and night. It tracks comprehensive health metrics including resting heart rate, heart rate variability (HRV), blood oxygen levels during sleep, skin temperature variations, sleep stages, daytime stress levels, and activity across 40+ exercise types with heart rate zones. The ring provides three daily scores: Sleep Score, Readiness Score, and Activity Score, along with stress and resilience ratings.

Key features include up to 8 days of battery life on a single charge, water resistance up to 100 meters suitable for swimming and sauna use, automatic activity detection, cycle insights with fertile window tracking, and the ability to store approximately two weeks of data. The ring is compatible with both iOS and Android devices through the comprehensive Oura app. The first month of Oura membership is included free, then requires a subscription of $5.99 per month to access full features and insights. Full recharge takes approximately 120 minutes.