DistriRead eXceL. Diagonal: 246.4 mm (9.7 "), Technology: E Ink, Gray scale levels: 16 levels of grey. Document formats supported: DOCX, FB2, PDF, PPTX, PRC, RTF, TXT, Audio formats supported: MP3, Image formats supported: BMP, JPG, PNG. Internal storage capacity: 4 GB, Compatible memory cards: SD, Maximum memory card size: 32 GB. Interface type: USB 2.0, USB connector type: mini USB A. Battery life: 8000 pages, Battery technology: Lithium-Ion (Li-Ion), Battery capacity: 1600 mAh