Garmin Forerunner 645 Music Smartwatch | 010-01863-30XBuilt-in music storage for up to 500 songsSync playlists from select streaming services like SpotifyGPS, GLONASS & Galileo support for accurate trackingWrist-based heart rate monitoringAdvanced running dynamics: cadence, stride length, ground contact timeUp to 7 days of battery life in smartwatch modeUp to 5 hours of battery life with GPS and musicSmart notifications for calls, texts, and app alertsGarmin Pay for contactless paymentsCustomizable watch faces and apps via Connect IQ