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A person wearing the Apple Watch Series 8.
The Apple Watch Series 8 isn't a big upgrade if you own a Series 5 now newer, but users of Series 3 or older will get the best experience.

The Apple Watch Series 8 is a highly refined Series 7 with three new features: Crash Detection, body temperature sensing, and a new Low Power Mode that gives it up to 36 hours of battery life. If you're coming from a Series 3 or older, or you don't already own an Apple Watch, you're going to love the Series 8.