BeBook Club. Diagonal: 152.4 mm (6 "), Technology: E Ink, Gray scale levels: 8 levels of grey. Document formats supported: CHM, DjVu, DOC, FB2, HTML, PDF, TXT, Audio formats supported: MP3, WAV, Image formats supported: BMP, GIF, JPG, PNG, TIF. Internal storage capacity: 0.5 GB, Compatible memory cards: MMC, SD, SDHC, Maximum memory card size: 16 GB. Interface type: USB 2.0, Headphone connectivity: 3.5 mm. Processor clock speed: 532 MHz