Exactly identical to the book in terms of single page content, page numbering, and font type

The ability to browse the book without connecting to the Internet

The ability to save a tag at a specific page and refer to it later

The program maintains a screen-lit mode for those who want to continue reading for a long time

If the program closes at a specific page and opens it again, it will automatically go to the page at which it was closed

An easy-to-access index of book contents

Clear line and readability in both horizontal and vertical positions