Apple Watch SE has an optical heart sensor for measuring your heart rate and heart rhythm. The Digital Crown provides haptic feedback when you turn it. The S5 SiP with 64-bit dual-core processor is up to two times faster than the S3 in Apple Watch Series 3. The always-on altimeter detects your elevation in real time.
Retina LTPO OLED Display
Apple S5 Chip
Splash, Water, and Dust Resistant