![watchOS 5.1.2 brings ECG functionality to Apple Watch Series 4, irregular heart rhythm notification to Watch Series 1 and later watchOS 5.1.2 brings ECG functionality to Apple Watch Series 4, irregular heart rhythm notification to Watch Series 1 and later](https://images.fonearena.com/blog/wp-content/uploads/2018/11/Apple-Watch-ECG-e1543470658597.jpg)
watchOS 5.1.2 brings ECG functionality to Apple Watch Series 4, irregular heart rhythm notification to Watch Series 1 and later
Readdle on Twitter: "Here is how to install the Calendars Apple Watch App and how to customize your watch face.🚀😃⌚️ https://t.co/tgI6TSPhnZ" / Twitter
![ECG app and irregular rhythm notification on Apple Watch available today across Europe and Hong Kong - Apple ECG app and irregular rhythm notification on Apple Watch available today across Europe and Hong Kong - Apple](https://www.apple.com/newsroom/images/product/watch/standard/Apple-iPhone-watch-ecg-de-screen-03272019_LP_hero.jpg.og.jpg)