Pocketbook PRO 612 Dark Grey. Diagonal: 152.4 mm (6 "), Technology: E Ink VizPlex, Gray scale levels: 16 levels of grey. Document formats supported: CHM, DjVu, DOC, DOCX, ePub, FB2, FB2.ZIP, HTML, PDF, PRC, RTF, TCR, TXT, Audio formats supported: MP3, Image formats supported: BMP, JPG, PNG, TIF. Internal storage capacity: 2 GB, Maximum memory card size: 32 GB, Internal RAM: 256 MB. Interface type: USB 2.0, USB connector type: micro USB A, Headphone connectivity: 3.5 mm. Processor clock speed: 533 MHz, Built-in processor: Samsung