Heart Rate Monitoring: Provides ECG-accurate heart rate readings. It is often paired with a chest strap transmitter for continuous data during workouts.

Fitness Tracking: Includes a calorie-count feature to monitor burn during exercise.

Durability: Water-resistant up to 30 meters, making it suitable for swimming and varied weather conditions.

Sold as is. Not sure how much more battery life it has. But can be changed.