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, low and high heart rate notifications, fall detection, and emergency SOS. It includes new Breathe watch faces, automatic workout detection, and new yoga and hiking workouts. Advanced features for runners such as cadence and pace alerts, new head-to-head competitions, activity sharing with friends, personalized coaching, monthly challenges, and achievement awards are also available. Built-in cellular connectivity allows you to use Walkie-Talkie, make phone calls, and send messages. You can 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.