This Reader Rabbit Reading Development Library 2 PC CD is perfect for children's learning. It includes letters and sounds that will help them improve their reading skills. The CD is compatible with Windows and Mac operating systems and requires less than 50 MB of hard drive space. It is an academic/education license category and comes with a unit quantity of 1. The CD is in the format of a unit and has a model number of Adobe Photoshop CS2. The minimum processor speed is 66 MHz and the CD is in English language. There is no limit to the number of devices that can use it.