Low and high heart rate notifications. Emergency SOS. 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 use Walkie-Talkie, make phone calls, and send messages. Listen to Apple Music and Apple Podcasts. And use Siri in all-new ways. Apple Watch Series 3 lets you do it all right from your wrist. GPS Optical heart sensor Digital Crown S3 with dual-core processor Accelerometer and gyroscope Swimproof watchOS 5 Aluminum case