only used once- it's amazing but due to illness What You'll Love Sleep score and insights Battery life (smartwatch mode)Up to 16 days Built-in mapping Daily suggested workouts Pulse Ox blood oxygenyes (spot-check, and optional all-day acclimation and in sleep) Garmin Pay™ Charging methodGarmin proprietary clip charger Memory/History32 GB Clock Features Time/date GPS Time Sync Automatic daylight saving time Alarm clock Timer Stopwatch Sunrise/sunset times Health & Wellness Monitoring Wrist-based heart rate (constant, every second) Daily resting heart rate Abnormal heart rate alertsyes (high and low) Respiration rate (24x7) Fitness ageyes (in app) Body Battery™ energy monitor All-day stress Relaxation breathing timer Breathwork Sleep Hydrationyes (in Garmin Connect™) Women's healthyes (in Garmin Connect Sensors GPS GLONASS Galileo Garmin Elevate™ wrist heart rate monitor Pulse Ox Blood Oxygen Saturation Monitor Barometric altimeter Compass Gyroscope Accelerometer Thermometer Depth sensor Pairs with Garmin Connect™ Mobile Smartphone compatibilityiPhone®, Android™ WellnessWalking, Pilates, Yoga Indoor runningTreadmill Running, Indoor Track Running Outdoor Running, Trail Running Outdoor recreationHiking, Indoor Climbing, Bouldering, Climbing, Hunting, Horseback Riding, Golfing CyclingBiking, Mountain Biking, Indoor BikingPool Swimming, Open Water Swimming On the WaterStand Up Paddleboarding, Rowing, KayakingSurfing, Kiteboarding, Windsurfing, Boating,Racket