Grammata Papyre 6.1. Diagonal: 152.4 mm (6 "), Gray scale levels: 16 levels of grey, Display resolution: 600 x 800 pixels. Document formats supported: pdf, rtf, epub, Audio formats supported: MP3, Image formats supported: JPG, TIF, BMP. Internal storage capacity: 0.5 GB, Compatible memory cards: SD, SDHC, Maximum memory card size: 16 GB. Interface type: USB 2.0. Processor clock speed: 400 MHz, Built-in processor: ARM9