Earlier this week, during Apple’s “It’s Glowtime” event, the tech giant introduced the new Apple Watch Series 10 and a new look for the Apple Watch Ultra 2. The smartwatches start at $399 and $799, respectively, and both are available for preorder ahead of their forthcoming release on Friday, September 20th.

The Apple Watch Series 10 is here, and it brings with it a host of subtle changes, from a larger screen to a thinner case (that still packs in more features than previous generations). But it also costs $150 more than Apple's entry-level Apple Watch SE, so what do you get for that extra dough?

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Apple's first wide-angle OLED display inside the Series 10 is 40 percent brighter than the Series 9. It allows for a wider variety of viewing angles. Its refresh rate, when idle, can update information from apps and complications once a second instead of the existing once-a-minute rate.

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It's possible that the Series 10 still has the hardware for blood oxygen monitoring and that the feature is disabled in software. Apple Watch models like the Series 8 and older and newer models sold outside of the United States aren't affected.

Apple announced its first smartwatch. A decade later to the day, the company debuted the Apple Watch Series 10, the latest iteration of the wearable line. In the time between, what users expect from their wrist-worn wearables has radically shifted.