Apple Watch Series 4
The first redesigned Apple Watch
![Apple Watch Series 4](https://9to5mac.com/wp-content/client-mu-plugins/9to5-core/includes/obfuscate-images/images/9to5mac-default.jpg?quality=82&strip=all&w=1600)
The Series 4 Watch was released on September 21st, 2018. New hardware included the S4 Chip, Electrical heart sensor w/ ECG app, and larger display (40mm and 44mm sizes).
The Apple Watch runs watchOS, and the current version is watchOS 5.
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