A new watch face capable of holding eight complications. ❤️ A Breakthrough in Health

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

40mm and 44mm sizes replaced the original 38/42mm.

Do you need a for an existing 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.

Internals were overhauled to match the ambitious new software.