Activity Tracking: Monitors steps, calories, distance, heart rate, sleep, GPS, blood oxygen, fall detection. Supports a variety of workouts like running, cycling, yoga and swimming.
Temperature Sensor: Added on Series 8 and 9
Notifications: Displays notifications from your phone.
Water Resistant: Yes

Activity Tracking: Monitors steps, calories, distance, heart rate, sleep tracking, blood oxygen, stress tracking, GPS, energy levels, hydration and women’s health. Tracks running, cycling, swimming, yoga, and more. Also has sports apps for workouts modes and guided exercises.
Performance metrics: Provides VO2 max, training effect, and recovery time.
Maps: Preloaded topographical maps for navigation.
Water resistant: Yes