FacThor PAPYRE 6.1. Diagonal: 152.4 mm (6 "), Gray scale levels: 4 levels of grey. Document formats supported: djvu, pdf, rtf, Audio formats supported: MP3, Image formats supported: BMP, HTML, JPG, MP3, PNG, TIF, TXT. Internal storage capacity: 0.5 GB, Compatible memory cards: SD, SDHC. Interface type: USB. Processor clock speed: 200 MHz, Built-in processor: Samsung ARM9