watch band
Are Series 4 band compatible with the new Apple Watch Series 5?
Apple Watch
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Band Compatibility
You can match this band with any Apple Watch Series 5 case of the same size. It also works with all previous versions of Apple Watch, including Apple Watch Series 3. The 40mm band works with the 38mm case; the 44mm band works with the 42mm case.
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Designed for Apple Watch Series 5.
Works with all previous versions of Apple Watch.