WatchOS 2

watchOS 2 is the second major release of watchOS for the Apple Watch series developed and distributed by Apple Inc. It was announced at WWDC 2015 alongside iOS 9, tvOS 9 and OS X El Caspian preceding a developer beta and released on September 21st to the general public of the same year. WatchOS was the predecessor to watchOS 3 and the successor to watchOS 1.

Product history
watchOS 2 was derived from iOS 9; both were announced on June 8, 2015 at the 2015 Worldwide Developers Conference.

Supported models

 * Apple Watch (original)