Forerunner 645 Music

Fitness

Key Features

  • Easily download up to 500 songs to your watch, and connect with Bluetooth® headphones (sold separately) for phone-free listening
  • Syncs music from select streaming services for offline listening¹
  • 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
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