Measure your workouts, from running and cycling to new high-intensity interval training. Track and share your daily activity, and get the motivation you need to hit your goals. Better manage everyday stress and monitor your heart rate more effectively. Automatically sync your favorite playlists. And stay connected to the people and info you care about most. Key Features: GPS and a barometric altimeter track how far and high you go New dual-core processor for faster app performance1 Ultimate sports watch and intelligent activity tracker Swimproof so you’re always ready for the pool or ocean2 Aluminum case watchOS 4 is even more intuitive and intelligent Legal Apple Watch Series 3 (GPS) requires an iPhone 5s or later with iOS 11 or later. 1Compared with the previous generation. 2 ISO standard 22810:2010. Appropriate for shallow-water activities like swimming. Submersion below shallow depth and high-velocity water activities not recommended.