... Favorite books, Library, Settings, Music, HelpKeys: Power On/Off, Zoom in/out, Pause/Play, Menu key, Back key, Page up/down ... Provide Document DRM, SDK for Source-supplier.4. Support Reflow in PDF, Cutting-Board5. Support of Customization of Fonts, Letter Spacing ... and Page Skip, 8 bookmarks for reading7. Silica gel keyboard in laser engraving, Comfortable Feel.8. Support TFT file, Customization of ...