Activity Tracking: Recovery score, strain score, heart rate, active minutes, workout modes, calories, temperature, hydration, workouts. Alerts you to move if inactive.
Notifications: Displays calls and messages.
Water resistant: Yes

Activity Tracking: Steps, heart rate, calories, sleep, fitness modes. Provides health data and trends through the Withings app.
ECG Functionality: Measures electrocardiograms to assess heart health.
Water resistant: Yes