Trevi EB 5006 INK. Diagonal: 152.4 mm (6 "), Technology: E Ink, Gray scale levels: 8 levels of grey. Document formats supported: ePub, FB2, HTML, PDF, TXT, Audio formats supported: MP3, WMA, Image formats supported: JPG. Internal storage capacity: 2 GB, Compatible memory cards: microSD. Interface type: USB 2.0, USB connector type: mini USB B. Operating system installed: Android