Series 4 Guide

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

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

Internals were overhauled to match the ambitious new software.

A 64-bit dual-core processor up to twice as fast as Series 3.

The Apple Watch Series 4, released in 2018, remains a landmark in wearable history. It was the first major redesign of the device, shifting it from a "luxury gadget" to a "critical health companion." ⌚ The Modern Face of Apple Watch

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