Retina LTPO OLED display, 1000 nits Ion-X glass display GPS and GPS + Cellular models S8 SiP with 64-bit dual-core processor W3 Apple wireless chip Digital Crown with haptic feedback Third-generation optical heart sensor High and low heart rate notifications Irregular rhythm notification International Emergency Calling Emergency SOS Crash Detection Fall Detection Water resistant 50 metres LTE and UMTS Wi-Fi Bluetooth 5.0 GPS/GNSS Compass Always-on altimeter Built-in speaker and mic 32GB capacity