Fundamentally redesigned and re-engineered, the largest Apple Watch display yet features a built-in electrical heart sensor, a new Digital Crown with haptic feedback, and low and high heart rate notifications. It includes fall detection and emergency SOS, new Breathe watch faces, and automatic workout detection. There are new yoga and hiking workouts, advanced features for runners like cadence and pace alerts, and new head-to-head competitions. Activity sharing with friends, personalized coaching, monthly challenges, and achievement awards are also available. You can use Walkie-Talkie, make phone calls, and send messages, as well as listen to Apple Music and Apple Podcasts. Siri can be used in all-new ways. Apple Watch Series 4 lets you do it all right from your wrist.