Garmin Forerunner 645 Music, Gps Running Watch with Contactless Payments, Wrist-based Heart Rate and Music, SlateRunning is more than just exercise - it’s a performance. Forerunner 645 Music has the tools to help you put on an outstanding show every time you lace up your shoes. It features on-device music storage so you can run with your favorite tunes, and contactless payments that let you buy what you need without missing a beat. With all those features, plus advanced running dynamics and performance monitoring tools, this GPS running watch is the instrument you need to refine the performance.Provides advanced running dynamics, including ground contact time balance, stride length, vertical ratio and moreGarmin Garmin HRM-RunThe HRM-Run heart rate monitor provides the most advanced running metrics to high-end Garmin Forerunner running watches. The strap is seamlessly comfortable and easily adjustable while the module is small, lightweight and fits entirely within the width strap.