Apple Watch Ultra 3 apple watch ultra3 Display Wide-angle OLED Retina display with Always-On feature and LTPO3 technology 1Hz refresh rate Actual screen area (514 x 422 pixels, 326 pixels per inch) Flat sapphire crystal interface, maximum brightness up to 3000 nits, minimum brightness of 1 nit Night mode for Apple Watch Ultra watch faces (Modular, Wayfinder, and others) Chip S10 chip with a 64-bit dual-core processor 4-core Neural Engine 64GB storage Health and Wellness Blood Oxygen app ECG app Cycle Tracking app with ovulation estimates based on past data Heart Rate app High and low heart rate notifications Irregular rhythm notifications Medications app Mindfulness app with mood tracking Noise app Sleep app including sleep stages Sleep Score feature Sleep apnea notifications Safety and Emergency SOS emergency feature Worldwide emergency calls Siren Flashlight Crash Detection feature Fall Detection feature Last available waypoint for emergency calls Noise monitoring Return Path Sensors Electrical heart sensor 3rd-generation optical heart sensor, Blood Oxygen sensor Temperature sensor Depth gauge Water temperature sensor Compass Always-on altimeter High-g accelerometer High-dynamic-range gyroscope Ambient light sensor Audio Three-microphone array with beamforming technology and wind noise reduction Dual speakers Media playback Siren Used for only one week Warranty is valid