On September 9, 2015, Apple announced the fourth generation Apple TV. It is the first major update to the platform since the release of the second generation Apple TV on September 1, 2010. While following the form factor of the previous 2nd and 3rd generation models, it is slightly taller in size. Featuring a new touch remote allowing swipe-to-select functionality instead of the old remotes' arrow button, with integrated Siri support, and motion sensor. The Siri button on the remote allows several functions, including searching across providers for content, accessing additional metadata, and video/audio controls. The 4th generation also uses a new TvOS operating system, with an associated app store allowing download of third-party apps for video, audio, games, and other content – initially from a limited range of providers on release, with others able to release further apps using new APIs allowing them to do so.