Apple Watch Series 9 - 41mm

41mm 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)