Tune in to your body and reach your goals with the Garmin vivoactive 4S GPS smartwatch, which features a broad range of all-day health-monitoring features, animated workouts and Garmin Coach. 4S is designed for a trimmer, more comfortable fit on your wrist (40mm case diameter) Tune in to your health with Pulse Ox and Body Battery™ energy monitor features and by tracking your respiration, menstrual cycle, stress, sleep, heart rate, hydration and more Pulse Ox estimates blood oxygen saturation for sleep monitoring and altitude acclimation; it is not a medical device intended to diagnose or monitor medical conditions Record all the ways to move with more than 20 preloaded GPS and indoor sports apps, including yoga, running, swimming and more Easy-to-follow animated cardio, strength, yoga and Pilates workouts help you reach your goals; choose from preloaded animated workouts or download more from Garmin Connect™ Garmin Coach provides free 5K, 10K and half-marathon training plans that guide you to reach your race goal and adjust based on your performance in the plan Easily download songs to your watch, including playlists and music from Spotify®, Amazon Music or Deezer (may require a premium subscription with a third-party music provider) Connect with wireless headphones for phone-free listening (headphones not included) Garmin Pay™ contactless payment solution lets you leave your wallet at home and pay with your watch (available for supported cards from participating banks) Safety and tracking features include incident detection for selected outdoor activities, which sends your real-time location to emergency contacts, when paired with smartphone Stay connected with smart notifications (when paired with a compatible device), for incoming calls, text messages, calendar reminders and more Personalize your watch with thousands of free watch faces, apps and widgets from our Connect IQ™ Store Battery performance: up to 7 days in smartwatch mode and up to 5 hours in GPS mode with music Heart-rate tracking and other data are intended to be a close estimation of your activity and metrics tracked, but may not be precisely accurate