Fundamentally redesigned and reengineered. The largest Apple Watch display yet. New electrical heart sensor. Reengineered Digital Crown with haptic feedback. Low and high heart rate notifications. Fall detection and Emergency SOS. New Breathe watch faces. Automatic workout detection. New yoga and hiking workouts. Advanced features for runners like cadence and pace alerts. New head-to-head competitions. Activity sharing with friends. Personalized coaching. Monthly challenges and achievement awards. You can make phone calls, send messages, and get notifications. And listen to Apple Music1 and Apple Podcasts. Apple Watch Series 4 lets you do it all right from your wrist.