Apple Watch Series 9 GPS 45mm

Hardware and Buttons Digital Crown Microphone Side button Electrical heart sensor Speaker / air vent Optical heart sensor Controls Digital Crown with haptic feedback Side button Double tap gesture Siri with on‑device processing Chip S9 SiP with 64‑bit dual‑core processor 4‑core Neural Engine 64GB capacity Sensors Electrical heart sensor Third‑generation optical heart sensor Temperature sensing1 Compass Always‑on altimeter High‑g accelerometer High dynamic range gyroscope Ambient light sensor Health and Wellness ECG app2 Cycle Tracking app with retrospective ovulation estimates3 Heart Rate app High and low heart rate notifications Irregular rhythm notifications4 Medications app Mindfulness app Noise app Sleep app including sleep stages Display Always‑On Retina LTPO OLED display Edge‑to‑edge display Ion‑X front glass (aluminium cases) Sapphire front crystal (stainless steel cases) Up to 2,000 nits maximum brightness 1 nit minimum brightness 326 pixels per inch