The Series 5 has an always-on Retina display.
Arguably the most important feature of the new model, the updated display shows a dimmed version of the screen at all times. Raising your wrist activates the screen to full brightness. Apple says that battery life should stay consistent with last year's model at around 18 hours per charge, thanks to a new high-efficiency processor.
In the Series 4, the display was off unless activated in order to conserve battery life.
The Series 5 has new health-tracking and safety features.
The Watch OS 6 operating system, which comes with the Series 5 and will roll out to older models on September 19, includes new health features that will allow people to track their menstrual cycles and see fertility windows. It also comes with a sensor that can warn about potentially unsafe noise levels, like at a concert.
The watch can detect if the wearer falls, and on cellular models, can now place emergency calls in more than 150 countries.
Both the Series 5 and Series 4 have heart-rate tracking, including low-heart-rate notification and atrial-fibrillation detection, as demonstrated in an emotional video from the Apple keynote.
The Series 5 comes with a compass.
On the Series 5, Apple added a built-in compass which will allow Apple Maps and other location apps to automatically orient correctly for easier navigation.
The Series 5 comes with more color and finish options.
The cellular version of the Apple Watch Series 5 will be available in aluminum, stainless steel, titanium, and ceramic finishes, with options for gold, space black, space gray, silver, and white, depending on the material.
Like last year's models, the base GPS model starts at $399, and the GPS and cellular model starts at $499. Stainless steel costs $699, while the titanium case costs $799. On the higher end, a special black stainless steel Hermès model of the watch starts at $1,249.
The Series 5 is more customizable.
Beyond the finish options, the variety of bands sold by Apple gives you nearly endless options to customize your Apple Watch. Collaborations with brands like Nike and Hermès provide extra ways to coordinate your smartwatch to the rest of your look.
Previously, Apple Watches came with a preselected band and you could opt to buy additional bands of your choosing. But this year, Apple created a new service called "Apple Watch Studio," which allows you to create the whole package, either online or in stores.
A basic nylon band will run you $49, but if you're looking for something more decadent, go for the $539 Hermes leather option.
These bands will also fit the Series 4, just make sure that you buy the right size.
