Electronic products used to read books were generally called e-book readers or e-book devices. An e-book reader is a device that can convert electronic documents (such as novels, magazines, newspapers, etc.) into readable e-books. It is usually powered by a Rechargeable or Polymer-Based battery and has a built-in storage capacity that can store a large number of electronic documents. The advantages of e-book devices were that they were portable, light, did not require an external power source, and were relatively cheap. In addition, e-book devices could also provide a better reading experience by touching the screen. In addition to e-book readers, there are many other types of electronic products that can also be used to read books, such as tablets, smart phones, and televisions. These devices all have built-in reading applications that can open e-book files to provide a similar reading experience.