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Apple announced its latest rugged wearable, the Apple Watch Ultra 4, during its "Surprise and Shine" iPhone event on Wednesday. It's joined by the new flagship Apple Watch Series 12, some new AirPods, the new iPhone 18 Pro and Pro Max, and the long-rumored foldable iPhone Duo.The Apple Watch Ultra 4 will start at $799, the same price as last year's Apple Watch Ultra 3. It also has the same design as its predecessor, but adds faster performance, a longer battery life, and new health and fitness features. Here's a rundown of its upgrades.The Apple Watch Ultra 4 introduces new Health Sensing System, S11 chip

The Apple Watch Ultra 4 is the latest iteration of Apple's biggest, most durable, and most expensive smartwatch. In a press release, the company called it "the ultimate sports and adventure watch" and "the most comprehensive wearable across health, fitness, and safety."

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The Apple Watch Ultra 4 supports a new Health Sensing System that takes more accurate, continuous heart rate readings. That includes more heart rate variability (HRV) measurements to gauge cardiovascular stress and recovery indicators, Apple said. Users will be able to compare their daytime and nighttime HRV measurements.The Health Sensing System also adds a Readiness fitness score that tells the user how prepared they are for certain workout activities based on past training sessions.