Apple Watch Series 9 - 45mm

S9

45 mm aluminum

LTPO OLED Always-on Retina display

Up to 2000 nits

ECG app

High and low heart rate

notifications/Irregular rhythm notifications/Low cardio fitness notifications

Blood Oxygen app

Sleep tracking/Sleep apnea

notifications

Emergency SOS/ International

emergency calling/Fall Detection

and Crash Detection

50m/Water resistant/Swimproof

GPS

Wi-Fi only options

S9 SiP

Double tap gesture

Fast on-device Siri with health

data access

Precision Finding for iPhone

Up to 18 hours

Up to 36 hours in

Low Power Mode

Fast charging (0–80% in 45

minutes)