The Apple Watch Series 12 is now available for pre-order, bringing a substantial list of changes over its predecessor. Last year, the Series 11 introduced just four changes over the Series 10, making it perhaps the smallest generational upgrade in the device's history. The Series 12 is a far more meaningful refresh, even though it essentially retains the same design for a third consecutive year.

It launches on Friday, September 18, at the same $399 starting price as the Series 11, which Apple has now discontinued. This guide lists all of the differences between the Series 11 and Series 12 models to help you understand the changes.

The new ceramic case marks the first ceramic Apple Watch since the Series 5 Edition in 2019, but it is slightly larger than the other models and weighs up to 52.9 grams in its 46mm Night Blue configuration. Even the aluminum and titanium models are now 1mm wider and around 2 grams heavier than their predecessors. At the same time, the display appears to have shrunk slightly, even though its resolution is unchanged.