S5 SiP with up to 2x faster 64-bit dual-core processor
watchOS 6 with Activity trends, cycle tracking, hearing health innovations and the App Store on your wrist
Aluminum case
The ECG app is available with the latest versions of iOS and watchOS on Apple Watch Series 4 or later. The ECG app is not intended for use by people under 22 years old.
To use Emergency SOS, your iPhone needs to be nearby. If your iPhone isn’t nearby, your Apple Watch needs to be connected to a known Wi-Fi network and you must set up Wi-Fi Calling.
