Built-in GPS, GLONASS, Galileo, and QZSS, S8 with 64-bit dual-core processor, W3 Apple wireless chip, Always-on altimeter, Capacity 32GB, Third-generation optical heart sensor, Electrical heart sensor, High-g accelerometer, Ambient light sensor, Retina LTPO OLED display, Digital Crown with haptic feedback, Built-in speaker and mic, Ion-X strengthened glass, Sapphire crystal and ceramic back, Wi-Fi 802.11b/g/n 2.4GHz, Bluetooth 5.0, Built-in rechargeable lithium-ion battery, Up to 18 hours of battery life, Water resistant 50 meters, Swimproof. Apple Watch SE requires an iPhone 8 or later with iOS 16 or later