Apple WatchOS 5.3 Full Operating System Specifications
Provides important security updates including a fix for the Walkie-Talkie app ECG app on Apple Watch Series 4 now available in Canada and Singapore Irregular heart rhythm notifications now available in Canada and Singapore Compatible: Apple Watch Series 1 or later
General Attributes
Apple
WatchOS 5.3
2019 Jul 22
WatchOS 5.3
Platform
Mach
Apple iOS / iPadOS family
Hardware Environment
ARM instruction set
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