The fourth-generation Apple Watch, released in September 2018 as the Series 4, introduced a dramatic redesign that pushed the boundaries of both style and functionality. With a larger, edge-to-edge display, the Series 4 offered nearly 30% more screen area than its predecessor, allowing for more information at a glance and an enhanced user experience. It also featured a slimmer, more refined case and came in both aluminum and stainless steel finishes. A major highlight was the introduction of the ECG (electrocardiogram) app, allowing users to take an electrocardiogram directly from their wrist—a groundbreaking feature for consumer health technology. Additionally, the Series 4 incorporated a new, faster S4 chip, improving performance and responsiveness, while the upgraded accelerometer and gyroscope enabled fall detection, an important safety feature for users of all ages. With its combination of health innovations, refined design, and enhanced performance, the Apple Watch Series 4 marked a major milestone in the evolution of wearable technology.