As part of the accessibility of digital books, the reading tool is very important. It must be adapted. Currently, very few e-reader models can both read text in audio and allow correct navigation. When I talk about navigation, I mean keys allowing you to move through the text and select actions indicated in the menu.
For my part, I tried a first model that was lent to me some time ago. He read the text of my book, which is quite astonishing and which, for people whose need arises, proves very useful function text to speech. Enlarging sans serif fonts is also an essential feature for reading digital books.