The second-generation Apple TV was the first Apple TV that featured a black body and an aluminum Apple Remote, an updated look compared to the silver and white Apple TV that was originally released in 2007.
Apple sold the second-generation Apple TV from September of 2010 until 2012, which is when the company released the third-generation Apple TV with an A5 chip and support for 1080p content.
The second-generation Apple TV is now classified as "vintage" in the United States and Turkey and "obsolete" in the rest of the world. Vintage products are those that have not been manufactured for more than 5 and less than 7 years ago, while obsolete products are those that were discontinued more than 7 years ago.
Both classifications essentially mean Apple is no longer providing hardware service for the device except in Turkey and California, where local statutes require that Apple continue to provide service and parts for a longer period of time.