The Apple Watch Series 9 has iterative updates, but one key feature might make the upgrade worth it.
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Apple Watch Series 9
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Apple Watch Series 9 Review: Double Tap
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Apple Watch Series 9 Review: Double Tap Is Convenient, But Not Essential
Apple Watch Series 9 First Look: Double Tap Gesture, Faster Performance - CNET
Apple watch Series 9's new 'Double tap' feature: Explained – News9Live
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