You can use the digital book on any personal computer including Windows and Apple computers, laptop or hand held device. However, if you are using a hand held device with a small screen it may limit your reading experience (you are going to be doing a lot of scrolling). All of our digital books do have an audio feature which allows you to hear the digital book. You can use your digital book on any device that you own. Your are not limited in the number of times you can copy the digital book.