Overview 42mm aluminum or titanium case Always-On Retina display Wide-angle OLED Up to 2000 nits Up to 40% brighter when viewed at an angle ECG app High and low heart rate notifications Irregular rhythm notifications Low cardio fitness notifications Sleep Tracking Sleep apnea notifications Vitals app featuring heart rate, respiratory rate, wrist temperature, and sleep duration Temperature sensing Cycle Tracking with retrospective ovulation estimates Emergency SOS International emergency calling Fall Detection and Crash Detection Water resistant Swimproof Depth gauge 6m Water temperature sensor GPS Available cellular connectivity S10 SiP Double tap gesture Faster on-device Siri with health data access Precision Finding for iPhone Up to 18 hours normal use Up to 36 hours in Low Power Mode Faster charging (0–80% in 30 minutes) What’s in the Box Case Band Apple Watch Magnetic Fast Charger to USB-C Cable (1m)