GPS model lets you take calls and reply to texts from your wristMeasure your blood oxygen with an all-new sensor and app1Check your heart rhythm with the ECG app2The Always-On Retina display is 2.5x brighter outdoors when your wrist is downS6 SiP is up to 20% faster than Series 55GHz Wi-Fi and U1 Ultra Wideband chipTrack your daily activity on Apple Watch and see your trends in the Fitness app on iPhoneMeasure workouts like running, walking, cycling, yoga, swimming, and danceSwimproof design3Sync your favorite music, podcasts, and audiobooksPay instantly and securely from your wrist with Apple PayHigh and low heart rate notifications and irregular heart rhythm notification2Built-in compass and real-time elevation readings• Can detect if you’ve taken a hard fall, then automatically call emergency services for youEmergency SOS lets you get help from your wrist4watchOS 7 with sleep tracking, cycling directions, updates to Siri, and new customizable watch facesAluminum cases available in new finishes