Series 4 -

The first over-the-counter wearable to offer a 30-second electrocardiogram.

Alerts for low heart rate, high heart rate, and irregular rhythms (AFib). 🚀 Re-engineered Performance 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. The first over-the-counter wearable to offer a 30-second

Every model featured a black ceramic and sapphire crystal back for better cellular reception. 📉 The Legacy high heart rate

Internals were overhauled to match the ambitious new software.

50% louder than previous models for clearer calls and Siri.