Low and high heart rate notifications. Emergency SOS. New Breathe watch faces. Automatic workout detection. 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. You can use walkie-talkie, make phone calls, and send messages. 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 Swimproof² watchOS 5 Aluminum case ¹ Apple Music requires a subscription ² ISO standard 22810:2010. Appropriate for shallow-water activities, such as swimming. Submersion below shallow depth and high-velocity water activities are not recommended. Apple Watch Series 3 (GPS) requires an iPhone 6s or later with iOS 13 or later. What's Included Silver Aluminum Case Leather Band 1m Magnetic charging cable In great condition used for awhile, no longer use it. Comes with charger