Apple Watch SE3 Technical Specifications > Display Always-On OLED Retina display with TPO technology Face of durable lon-X glass with xﮫ more crack resistance Maximum brightness up to 1000 nits/square meter Minimum brightness of 2 nits/square meter Pixels per inch Chip S10 chip with 64-bit dual-core processor Neural Engine with 4 cores 64GB capacity Health and Wellness Cycle Tracking app with ovulation estimates based on previously observed data Heart Rate app High and low heart rate notifications Irregular rhythm notifications Medications app Mindfulness app Noise app Sleep app including sleep stages Sleep Score feature Notifications