Take calls and reply to texts, right from your wrist; Advanced safety features, including Fall Detection, Emergency SOS, and Crash Detection; Track your daily activity on Apple Watch, and see your trends in the Fitness app on iPhone; Get high and low heart rate and irregular rhythm notifications; Listen to your favourite music, podcasts, and audiobooks (for use with GPS models); Make purchases instantly and securely from your wrist with Apple pay; Swimproof design; Sleep states tracking lets you see how much time you spend in REM, core and deep sleep;