Garmin Forerunner 645M GPS Running Watch, Medium (Cerise)

Easily download up to 500 songs to your watch, and connect with Bluetooth headphones (sold separately) for phone-free listening
Provides advanced running dynamics3, including ground contact time balance, stride length, vertical ratio and more
Uses wrist-based heart rate4 to offer performance monitoring features, including evaluating your current training status
Battery life5: up to 7 days in smartwatch mode; 5 hours in GPS mode with music
Built-in Sports: The running sports are just the beginning, because there is also built-in support for cycling, pool swimming, row, elliptical, cardio and lots more
Wellness Monitoring: Features all-day stress tracking and relaxation-based breathing timer to help balance stress and rest
In-Box Contents: Forerunner 645M, Charging Cable, Manual