Alerts for low heart rate, high heart rate, and irregular rhythms (AFib). π Re-engineered Performance
50% louder than previous models for clearer calls and Siri. Series 4
While it no longer receives the latest watchOS updates, the Series 4 is credited with saving the product line. By prioritizing and screen real estate , Apple moved away from being a "mini-phone" on the wrist and toward being a life-saving tool. Alerts for low heart rate, high heart rate,
The Digital Crown added mechanical-feeling clicks for precise scrolling. Alerts for low heart rate
Internals were overhauled to match the ambitious new software.