Papyre ebook 613. Diagonal: 152.4 mm (6 "), Technology: E Ink Pearl, Gray scale levels: 16 levels of grey. Document formats supported: CHM, DjVu, DOC, ePub, FB2, HTML, PDB, PDF, PPT, PRC, RTF, TXT, Audio formats supported: MP3, WAV, Image formats supported: BMP, GIF, JPG, PNG. Internal storage capacity: 2 GB, Compatible memory cards: SD, SDHC, Maximum memory card size: 32 GB. Interface type: USB 2.0, Headphone connectivity: 3.5 mm, Wireless LAN type: 802.11b, 802.11g. Operating system installed: Linux