Apple has unveiled the Apple Watch Ultra 4, its ultimate sports and adventure watch, featuring the new Health Sensing System and S11 chip. The device delivers the most accurate heart rate sensing in a wearable, with higher-frequency heart rate and HRV measurements, plus a new readiness score for athletes. Battery life extends to 45 hours for outdoor workouts, and it includes the most accurate on-device GPS in a sports watch.

A redesigned Health app arrives later this year, adding a Longevity tab and Health Age feature. The S11 chip also powers Audio Intelligence features for conversation reminders and sound alerts. With watchOS 27, Siri AI gains personal context and broad knowledge.

The watch retains advanced workout tracking, sleep tracking, heart health notifications, ECG, and satellite communications.