The Apple Watch Series 4 was released in September 2018 and is the fourth generation of Apple's popular smartwatch. Some of the key features of the Apple Watch Series 4 include:
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Larger Display: The Series 4 has a larger display than previous models, with a 30% increase in screen size.
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ECG Monitoring: The Series 4 has an electrical heart sensor that can take an electrocardiogram (ECG) reading, making it the first over-the-counter device to offer ECG