Autovision AV605. Diagonal: 152.4 mm (6 "), Technology: E Ink, Gray scale levels: 16 levels of grey. Document formats supported: CHM, DjVu, EPUB, FB2, HTML, PDB, PDF, PRC, RTF, TCR, TXT, Audio formats supported: MP3, Image formats supported: BMP, GIF, JPG, PNG. Internal storage capacity: 2 GB, Compatible memory cards: microSDHC, Maximum memory card size: 16 GB. Interface type: USB 2.0, Headphone connectivity: 3.5 mm. Operating system installed: Linux