The Apple MAC OS X LEOPARD Version 10.5.1 Retail Install DVD with Manual is an operating system designed specifically for Mac computers. It comes in a DVD format with a minimum RAM requirement of 512 MB. This version includes a manual and is suitable for one device. The product is manufactured by Apple in the United States and is licensed for retail use. The operating system is in English language and has a compact size of 5 inches in length and height, and 0.5 inches in width.