Watch Ultra 4 GPS + Cell 49mm Black Titanium Case with Burgundy Alpine Loop L

Brand : Apple Model : Apple Watch Ultra 4 Longest Apple Watch Battery Life: Up to 50 hours of normal use. Extended Workout Battery: Up to 18 hours of standard workout tracking and up to 45 hours of Max Extended Workout tracking. Low Power Mode: Up to 84 hours of battery life. Fast Charging: 15 minutes of charging provides up to 18 hours of use. Advanced Health Sensing System: Redesigned optical and electrical sensors with larger, more power-efficient green LEDs provide more frequent heart monitoring. High-Frequency Heart Rate Tracking: Background heart rate readings every five seconds. HRV Tracking: Heart rate variability measurements as often as every five minutes, day and night. Readiness Experience: Provides a daily readiness score based on recent activity, vital signs, and sleep. Sleep Score: Analyzes sleep duration, bedtime consistency, wake-ups, and sleep stages. ECG: Generate a single-lead electrocardiogram using the ECG app. Cycle Tracking: Provides period, fertile-window, and retrospective ovulation estimates. Advanced Running Metrics: Track running power, cadence, pace, distance, elevation, and VO2 max. Heart Rate Zones: Automatically calculated and personalized using your health data, with support for manual adjustments and alerts. Custom Workouts: Create workouts with work and recovery intervals, pace targets, and more. Pacer: Set time and distance goals and track whether you are maintaining your target pace. Multisport Tracking: Automatically recognizes transitions between swimming, cycling, and running and records metrics for each segment. Cycling Metrics: Displays workout information and supports Live Activities on iPhone. Power Zones: Connect a compatible power meter to estimate Functional Threshold Power (FTP) and track cycling intensity. Strength Training: Advanced workout tracking for strength exercises, including bench press and barbell workouts.