Apple Watch Ultra 4

The Apple Watch Ultra 4 provides up to 45 hours of Max Extended Workout tracking and 50 hours of typical use, with a 15-minute fast-charge adding 18 hours of runtime. It features a redesigned Health Sensing System with enhanced optical and electrical heart-rate sensors, HRV measurements every five minutes, and a personal readiness score that combines activity, vitals, and sleep data. Its titanium case with sapphire crystal meets MIL-STD-810H, WR100, and IP6X standards, includes built-in satellite communications, dual-frequency GPS, and S11-powered Siri AI and Audio Intelligence.