Interead CL600-BK. Diagonal: 152.4 mm (6 "), Gray scale levels: 8 levels of grey, Display resolution: 600 x 800 pixels. Document formats supported: pdf, rtf, Audio formats supported: MP3, Image formats supported: EPUB, FB2, HTML, TXT. Internal storage capacity: 1 GB, Compatible memory cards: SD. Operating system installed: Linux. Processor clock speed: 400 MHz, Built-in processor: Samsung S3C2440