In lieu of the growing popularity of e-books, e-readers are a convenient way to read e-books using wireless connectivity. One of the main advantages that e-readers have over printed books is the size and portability of the devices. In comparison to laptop computers, e-readers are cheaper and tend to optimize battery life. The display of specialized e-reader devices also tends to optimize readability. In a 2017 Statista Survey, 80 percent of respondents stated that the battery capacity was the most important criteria for purchasing an e-reading device and 45 percent believed that up to a hundred U.S. dollars was an appropriate price for an e-reader device.
Many of the major book retailers and third-party developers also offer e-reader applications for desktops, tablets and mobile devices where online purchases can be made for e-books and e-reader apps that run on these platforms. As of 2018, there was a projected amount of approximately 90.5 million owners of e-readers in the United States, and that number is expected to increase to over 93 million by 2020.