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Story summary
- Apple launched the Apple Watch Series 12 and Ultra 4 featuring a Health Sensing System.
- The watches now record heart rate every five seconds, up from five-minute intervals.
- The new Theater Mode defaults to five-minute checks to reduce visible light in dark settings.
- Users can enable continuous monitoring in Theater Mode via Settings > Heart > Allow Continuous Measurements.
- Sleep Mode also switches to five-minute intervals, extending battery life while inactive.