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46mm or 42mm aluminum or titanium case size LTPO3 OLED AlwaysβOn Retina display Wide-angle OLED Up to 2000 nits Up to 40% brighter when viewed at an angle ECG app1 High and low heart rate notifications1 Irregular rhythm notifications2 Low cardio fitness notifications Sleep Tracking Sleep apnea notifications3 Vitals app featuring heart rate, respiratory rate, wrist temperature, and sleep duration4 Temperature sensing5 Cycle Tracking with retrospective ovulation estimates6 Emergency SOS7 International emergency calling8 Fall Detection and Crash Detection7, 9 β
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