... TXT, FB, PDF, EPUB, HTM, MOBI, RTF, HTML and other text to read format * Support for multiple tasks (multi-tasking operations, such ... as reading a book while listening to music) and digital recording (built-in high definition microphone, ... turned off * Support firmware upgrade Support TF card memory expansion Text format support TXT, FB2, PDF, EPUB, HTM, MOBI, RTF, ...