The Apple Watch Series 4 is the first predominant redesign of the Apple Watch, featuring larger displays with thinner bezels and rounded corners, and a slightly rounder, thinner chassis with a redesigned ceramic back. Internally there is a new S4 64-bit dual-core processor, capable of up to double the S3's performance, upgraded 16 GB storage, and a new electrical heart sensor. The microphone was moved to the opposite side between the side button and the digital crown to improve call quality. Other changes include the digital crown incorporating haptic feedback with the Apple Haptic Engine and includes the new Apple-designed W3 wireless chip.
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