Apple Watch Ultra 4 GPS + Cellular 49mm Smartwatch | Natural Titanium Case, Translucent Gray Ocean Band - One Size. Advanced Health + Fitness Tracking, 2+ Day Battery

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• MULTI-DAY BATTERY LIFE—Ultra 4 is a smartwatch with ultramarathon battery stamina,* perfect for runners to go the distance—with up to 45 hours of Max Extended Workout tracking.* And you can fast-charge in just 15 minutes for up to 18 hours of use.*
• STAY CLOSER TO YOUR HEART HEALTH—The most accurate heart rate sensing in a wearable,* Ultra 4 now measures HRV as often as every five minutes for insights on stress and recovery, and background heart rate readings every five seconds.
• A FULL-FEATURED HEALTH TRACKER—Better understand your body with advanced health insights. View your overnight health metrics with the Vitals app and get a daily sleep score,* track your menstrual cycle,* and take readings of your blood oxygen.*
• CHECK YOUR READINESS FOR THE DAY—Know when to rest or put yourself to the test. The readiness experience gives you one clear score and can help you determine your capacity to take on the day by analyzing your recent activity, vitals, and sleep.
• ULTIMATE RUNNING AND WORKOUT COMPANION—A superior fitness tracker for distance running, triathlons, mountain biking, strength training, and more. Ultra 4 has precision dual-frequency GPS, Pacer, Heart Rate Zones, Custom Workouts, training load, and more.