The Oura Ring 4 Gold is an advanced health and wellness tracking smart ring featuring research-grade sensors in a premium titanium design. This Costco exclusive bundle includes the ring plus an additional charging plinth for convenient charging at home or while traveling.

The Ring 4 introduces groundbreaking Smart Sensing technology with 18 sensing paths that dynamically adjust sensor configurations based on context and conditions. This delivers 120% improvement in blood oxygen tracking, 31% improvement in nighttime heart rate accuracy, and 7% improvement in daytime heart rate monitoring compared to previous generations. The ring features red and infrared LEDs for blood oxygen measurement during sleep, green and infrared LEDs for 24/7 heart rate and heart rate variability tracking, a digital temperature sensor for illness detection and cycle tracking, and a 3D accelerometer for continuous activity monitoring.

Key features include automatic detection of 40+ workout types without manual input, comprehensive sleep stage tracking validated against polysomnography, stress monitoring, women's health features, and personalized readiness scores. The fully titanium construction ensures durability with recessed sensors that reduce friction and pressure. Water resistant to 100 meters (328 feet), suitable for sauna and water sports. Battery life reaches up to 8 days on a single charge with charging time between 20-80 minutes. The ring measures 7.90mm in width and 2.8mm in thickness. Compatible with both iOS and Android devices via Bluetooth Low Energy connectivity. Operating temperature range is -10 to 54°C (14 to 129°F).

An Oura Membership subscription is required to access all features. The first month is free, then $5.99 per month or $69.99 per year.