https://www.techradar.com/news/new-apple-watch-4-teardown-proves-specs-are-less-important-than-experience

The Apple Watch 4 is crammed full of improved features, from its ECG heart monitor to its much louder internal speaker. So how does Apple squeeze more tech in, without making its wrist-mounted computer unwearable?

With some engineering ingenuity, that's how. The teardown team at iFixit has yet again exposed the innards of the latest Apple gear, revealing a significant internal redesign over the Apple Watch 3.