1. 6" ultra slim e-book 2. Net Work (Optional): Wireless Wi-Fi 3. Mini USB ... Function :NoCPU: Samsung Arm9 CoreOperation System: Linux2.6RAM:SDRAM 64MBE-BOOK File Format: TXT、PDF、HTML、CHM、RTF、EPUB、DJVU、BMK ... External Memory card: SD/MMC CARD SlotInterface:Earphone JackMain Menu: Book, music, photos, bookmarks, favorites, recent, file, explorer, setting, user manualLanguage ...