Series 4 -

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

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. Series 4

A slimmer profile that sits closer to the wrist. The first over-the-counter wearable to offer a 30-second

Automatically calls emergency services if you are unresponsive after a fall. Series 4

The Series 4 introduced the design language Apple still uses today.

Are you writing a on Apple's design evolution?