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Feature

Displays notifications and runs apps, accelerometer and gyroscope, heart rate sensor
Water-resistant to 164 feet (50 meters), heart rate monitor, built-in GPS, barometric altimeter
Gps + Cellular: Apple watch Series 3 (GPS + Cellular) requires an iPhone 6 or later with iOS 11 or later. Apple watch and iPhone service provider must be the same
Water resistant to 50M