When you head out for a run, be sure you have the right tool for the job. Garmin Forerunner 45 has all the features you need in a sleek GPS watch you'll want to wear all day and night. 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 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 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, indoor track, treadmill, elliptical, yoga and more Essential GPS data accurately tracks distance, pace, intervals and more Full color display; customize with free watch faces from the Garmin Connect IQ™ store Battery life: up to 7 days in smartwatch mode; 14 hrs. in GPS mode Garmin Forerunner 45 has a 42mm diameter face; Garmin Forerunner 45S (sold separately) has a 40mm diameter face for smaller-sized wrists