You do the running. Garmin Forerunner 245 does the thinking. It tracks your runs and training stats, crunching the numbers for you and getting to know all about your performances and goals. 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 to indicate if you're undertraining or overdoing it Additional performance-monitoring features include VO2 max, training load focus, recovery time, aerobic and anaerobic training effect, as well as an improved race predictor Get free adaptive training plans from Garmin Coach, or create your own custom workouts on the Garmin Connect™ online fitness community Health-monitoring tools include wrist-based heart rate, all-day stress tracking, 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 Pair with Running Dynamics Pod or HRM-Run/Tri™ monitors (not included) for advanced running dynamics like ground contact time balance, stride length, vertical ratio and more Connected features: smart notifications for calls and texts, automatic uploads to Garmin Connect™, LiveTrack, and the ability to control and play music on your phone Preloaded sports apps like running, cycling, pool swimming, 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 7 days in smartwatch mode; up to 24 hrs. in GPS mode