Prestigio eBook Reader PER3362B. Diagonal: 152.4 mm (6 "), Technology: E-Ink, Gray scale levels: 16 levels of grey. Document formats supported: pdf, rtf, djvu, epub, Audio formats supported: MP3, Image formats supported: JPG, PNG, GIF, TIF, BMP. Internal storage capacity: 2 GB, Compatible memory cards: SD, SDHC, Maximum memory card size: 8 GB. Interface type: USB 2.0, Microphone connectivity: 3.5 mm. Operating system installed: Linux