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 other multi-sport tracking. Also has sports apps for workouts modes and guided exercises. Allows creating and customizing workouts. Assesses readiness for workouts.
Performance metrics: Provides VO2 max, training effect, and recovery time.
Maps: Includes preloaded topographic maps.
Smart notifications: Displays notifications from your phone.
Water resistant: Yes

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