The Oura Ring 4 is a premium health and fitness tracking smart ring featuring a fully titanium construction with recessed sensors for comfortable all-day wear. This Costco-exclusive bundle includes the ring plus an additional charger, providing two size-specific chargers total for convenient charging at home and on the go.

The ring utilizes advanced Smart Sensing technology with an 18-path multi-wavelength photoplethysmography (PPG) subsystem to continuously monitor your health metrics. It tracks sleep stages, resting heart rate, heart rate variability, blood oxygen levels during sleep, body temperature variations, and respiratory rate. The built-in accelerometer enables automatic activity detection for over 40 different exercise types with real-time heart rate zones.

Measuring 7.90mm in width and 2.8mm in thickness, the lightweight titanium ring weighs between 3.3g and 5.2g depending on size. It offers up to 8 days of battery life on a single charge and fully charges in 20 to 80 minutes using the included USB Type-C chargers. The ring is water resistant up to 100 meters, making it suitable for swimming, water sports, and sauna use.

The Oura Ring 4 connects via Bluetooth Low Energy to the redesigned Oura App, compatible with both iOS and Android devices. The app provides comprehensive insights through three streamlined tabs: Today, Vitals, and My Health. Features include daytime stress monitoring, cycle insights with fertile window tracking, VO2 Max estimation, and personalized daily readiness scores. Size 7 is available in both Costco warehouses and online at Costco.com. An Oura Membership is required for full functionality, with the first month free and then $5.99 per month thereafter.