Oura Ring 4

The Oura Ring 4 is the world's leading smart ring for health tracking.

Worn 24/7 like a regular ring, it tracks sleep stages, heart rate, HRV,

body temperature, SpO2, activity, and cycle syncing — all from your finger.

Key Features:

- Tracks sleep stages, efficiency, timing, and sleep score nightly

- Continuous heart rate monitoring (day and night)

- Heart Rate Variability (HRV) for stress and recovery

- Body temperature sensing (detects illness before you feel it)

- SpO2 blood oxygen monitoring

- AI Advisor powered by machine learning for daily health guidance

- Up to 8 days battery life

- Titanium construction — lightest Oura Ring ever

- Sizes 4–15; available in Silver, Black, Gold, Stealth, Rose Gold, and more

- Works on Android and iOS