Apple Watch Series 9

Apple Watch Series 9 45mm or 41mm case size Aluminum or stainless steel Speaker Microphone Control: Digital Crown with haptic feedback Side button Double tap gesture On-Device Siri Display: Always-On Retina LTPO OLED display Edge-to-edge display Ion-X front glass (Aluminum cases) Sapphire front crystal (Stainless steel cases) Up to 2000 nits maximum brightness 1 nit minimum brightness Chip: S9 SiP with 64-bit dual-core processor 4-core Apple Neural Engine 64GB capacity Sensors: Electrical heart sensor and ECG app Footnote 3 Third-generation optical heart sensor High and low heart rate notifications Footnote 3 Irregular rhythm notifications Footnote 4 Sleep stages Temperature sensing Footnote 5 Compass with Waypoints and Backtrack Always-on altimeter High-g accelerometer Ambient light sensor Safety: Emergency SOS Footnote 7 International emergency calling Footnote 8 Crash Detection Footnote 7 Fall Detection Footnote 7 Splash, Water and Dust: Water resistance 50m