Overview

• The feature is now available in more than 150 countries, with South Korea newly supported.
• It works on Apple Watch Series 9, Series 10, Series 11, Apple Watch Ultra 2, and Apple Watch Ultra 3.
• The system uses the watch’s accelerometer to detect subtle wrist movements linked to irregular breathing.
• Users must wear the watch consistently for several nights before receiving an initial reading.
• Nightly breathing disturbances are recorded in the iPhone Health app, and Apple lists regional availability on its website.