Comparison PocketBook Basic Lux 4 vs PocketBook 628 Touch Lux 5

File formats supported by the reader that contain text (and sometimes graphic information). The most popular in the CIS are, in particular, FB2, TXT, HTML, WORD (DOC), RTF, ePUB, Djvu and PDF.

Many advanced reader models are able to "perceive" not only e-readers, graphic files and videos, but also other file formats. The most common support for music files: MP3, WMA, in especially advanced cases — AAC, OGG, lossless formats APE and FLAC. Of the non-musical formats, some readers support ZIP and RAR archive files, as well as Microsoft Office documents (PPT(X), XLS(X))

Possibility of expansion of own built-in memory at the expense of replaceable memory cards. In addition to increasing the amount of memory, such a medium facilitates the exchange of information between an e-book and other devices: for example, you can download a book to a laptop equipped with a card reader, write it to a memory card and install the card in an e-book. Note that at the present time several types of memory cards are actively used, and not all of them are mutually compatible; therefore, when buying a book with a memory card slot, you need to pay special attention to the type of cards supported.