Fundamentally redesigned and re-engineered, the largest Apple Watch display yet features a built-in electrical heart sensor and a new Digital Crown with haptic feedback. It includes low and high heart rate notifications, fall detection, and emergency SOS. Enjoy new Breathe watch faces and automatic workout detection, along with new yoga and hiking workouts. Advanced features for runners include cadence and pace alerts, new head-to-head competitions, activity sharing with friends, personalized coaching, and monthly challenges with achievement awards. Built-in cellular connectivity allows you to use Walkie-Talkie, make phone calls, and send messages. Stream Apple Music and Apple Podcasts, and use Siri in all-new ways, even while away from your phone. With Apple Watch Series 4, you can do it all with just your watch.