Apple Watch Series 4

The Apple Watch Series 4 was a 4th generation smartwatch designed and produced by Apple Inc. The watch was released on September 21, 2018, along with the iPhone XS and iPhone XR at Apple's annual September event in the Steve Jobs Theater. It succeeded the Apple Watch Series 3.

Features
The Series 4 was the first Apple Watch to come in two new sizes: a 40mm and a 44mm case size unlike the 38mm and 42mm with matching band sizes for both. Cases were also available in stainless steel.

Nike+
A special edition Nike+ version of the Series 5 was made with added benefits such as a map of your run, special custom watch faces, some that represent various Nike products, the Nike+ Run Culb app built-in, and exclusive Nike bands.