You're an athlete, and this is your watch. To help you hit new PRs, Garmin Forerunner 945 features music storage and streaming, maps and the most advanced performance-tracking features Garmin offers. Easily store and play up to 1,000 songs on your watch, and connect with Bluetooth® headphones (not included) for phone-free listening Sync your playlists from selected music streaming services to put your songs on your wrist when paired with a compatible smartphone (may require premium subscription) Garmin Pay™ contactless payment solution (available for supported cards from participating banks) lets you make payments with your watch—no need to carry cash or cards Onboard color maps feature Trendline™ popularity routing, which uses billions of miles of Garmin Connect™ data to help you find and follow the best paths Assistance (built-in tracking/safety feature) lets you send your real-time location to emergency contacts through a paired compatible smartphone Incident Detection alerts your emergency contacts automatically in the event of certain incidents (e.g., bike crash, collapse during a run); paired smartphone required Watch evaluates your training status (adjusted for heat and altitude factors) to indicate if you're undertraining or overdoing it Performance-monitoring features include VO2 max, training load focus, aerobic/anaerobic training effect, recovery time, EPOC and respiration rate and improved race predictor Advanced running dynamics include ground contact time, stride length, balance and vertical ratio (requires a paired running pod, HRM-Run or HRM-Tri strap, not included) Health-monitoring tools include wrist-based heart rate, all-day stress tracking, relaxation breathing timer, Body Battery™ energy monitor, sleep analysis and more Wrist-based pulse oximeter is a non-medical device that provides your estimated blood oxygen saturation level—useful when adjusting to higher altitudes Built-in navigation sensors include 3-axis compass, gyroscope and barometric altimeter, as well as multiple satellite system (GPS, GLONASS and Galileo) network capability This system allows this watch to track in more challenging environments than GPS alone Preloaded sports apps like running, cycling, open water swimming, pool swimming, triathlon, indoor track, treadmill, elliptical, yoga and more Customize with free watch faces, apps, widgets and data fields from the Garmin Connect IQ™ store Battery life: up to 2 weeks in smartwatch mode, 10 hrs. in GPS mode with music, 36 hrs. in GPS mode without music, or up to 60 hrs. in UltraTrac™ mode