SpO2 monitoring, refined performance and new colors make the Series 6 the best Apple Watch yet - CNN

Since its debut way back in 2015, each iteration of the Apple Watch has come with newer and, well, better features. The Series 3 was the first with cellular, Series 4 increased the display and Series 5 gave us an always-on display. https://www.cnn.com/2020/09/24/cnn-underscored/apple-watch-series-6-review/index.html