The overall size of the Apple Watch Series 4 is slightly larger than the previous generation, and the thickness is slightly thinner than the Apple Watch Series 3, but the display area is greatly improved (40mm models are 35% larger than the previous generation 38mm, 44mm models are 42mm larger than the previous generation) Big 32%), this is the first thing you noticed. The Apple Watch Series 4 is no longer divided into 38mm and 42mm phenotypes, but is divided into 40mm and 44mm phenotypes. The display area of this generation of 40mm phenotype exceeds the 42mm phenotype of the previous generation, thanks to the OLED display with a rounded edge design and a narrower frame. And to match this change, WatchOS 5's native applications and new dials (complex functions) make full use of these more display areas, such as the complex content of the Series 4 unique Infograph dial with many curved display areas, and The Vapor, Fire / Water and Liquid Metal dials fill the entire screen on the Series 4, while the previous generation products can only be displayed in the center circle.
In terms of performance, the Apple Watch Series 4 features a new S4 chip with a speed phenotype that is twice that of the Series 3 S3 chip. The back of the watch body features a new black ceramic and sapphire crystal design that allows radio waves to penetrate the front and The back side improves the cellular connection. At the same time, ECG ECG reading function has been added, but it is currently not tested. Apple will test it later this year. The Apple Watch Series 4 stainless steel model also features sapphire glass for a more scratch-resistant finish.