The 2009 Rosetta Stone English American Version is a comprehensive language course set that includes 3 levels, covering everything from beginner to advanced. This DVD format course is designed for use on various Apple Mac operating systems, such as Leopard, Snow Leopard, and Mountain Lion. With unlimited devices allowed for use, this product is perfect for anyone looking to improve their English skills. Made by the reputable brand Rosetta Stone in the United States, this software provides a structured and effective way to learn English as a second language.