Other Changes and Improvements
the background, and if it detects an irregular heart pattern on five rhythm checks over a minimum of 65 minutes, it will send a notification to the user. Both features have FDA approval.
Size and Resolution
Size: The 40mm Apple Series 4 watch has a 40mm case and 759 sq. mm display area. Series 4 is 10.7 mm thin. This compares to the older 38mm Apple Series 3 watch which is a 38mm case, a 563 sq. mm display area, and is 11.4 mm thin. The 44mm Apple Series 4 watch now has a 44mm case and 977 sq. mm display area. Series 4 is 10.7 mm thin. This compares to the older 42mm Apple Series 3 which is a 42 mm case, a 740 sq. mm display area, and is 11.4 mm thin. Screen Resolution: The 40 mm Apple Series 4 watch has a screen resolution of 324 x 394 pixels. The older 38mm Apple Se- ries 3 has a screen resolution of 272 x 340 pixels. The 44 mm Ap- ple Series 4 watch has a screen resolution of 368 x 448 pixels. The older 42 mm watch has a screen resolution of 312 x 390 pixels. The graphic below clearly shows the impact of the addi- tional display area on the Series 4 watch, which is accom- plished by both the increased size of the watch and the decreased bezel size and rounding of the corners. Display quality is further improved by the improved screen resolution.
ECG Detail
The Apple Watch Series 4 has sensors on the back and on the Digital Crown that work together with watchOS 5.1.2 to take an ECG similar to a single-lead graph. Apple describes the process: “To take an ECG recording at any time or following an irregu- lar rhythm notification, users launch the new ECG app on Apple Watch Series 4 and hold their finger on the Digital Crown. As the user touches the Digital Crown, the circuit is completed and electrical signals across their heart are measured. After 30 sec- onds, the heart rhythm is classified as either AFib, sinus rhythm or inconclusive. All recordings, their associated classifications and any noted symptoms are stored securely in the Health app on iPhone. Users can share a PDF of the results with physicians”. This new technology, for the first time, gives people the oppor- tunity to capture important information about their heart, as it is happening. For more information on the ECG app and how to set it up: https://support.apple.com/en-us/HT208955 For more information on the irregular rhythm notification: https://support.apple.com/en-us/HT208931 For more information for medical professionals and providers https://www.apple.com/healthcare/apple-watch/
Apple Watch Series 3 & Series 4 Display Comparison
Speed & Performance: The Apple Watch Series 4 has a 64-bit dual-core S4 processor, which Apple says in two times faster than the Dual-Core S3 processor in the Apple Watch Series 3. It is responsible for the apps ability to launch and perform faster.
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