The Apple Watch Ultra 3 (GPS + Cellular) in a 49 mm titanium case features Apple’s S10 SiP chip with a 64-bit dual-core processor and a four-core Neural Engine, a bright Always-On Retina OLED LTPO3 display with up to 3000 nits peak brightness and increased active screen area for improved readability. It includes a comprehensive suite of advanced sensors such as an electrical heart sensor, a third-generation optical heart sensor, a blood oxygen (SpO₂) sensor and a temperature sensor, along with specialized tools like a depth gauge, water temperature sensor, compass and altimeter.