BeBook Mini. Diagonal: 127 mm (5 "), Display resolution: 800 x 600 pixels. Document formats supported: djvu, epub, pdf, rtf, Audio formats supported: mp3, Image formats supported: bmp, gif, jpg, png, tif. Internal storage capacity: 0.5 GB, Compatible memory cards: SD. Interface type: USB 2.0. Battery technology: Lithium-Ion (Li-Ion), Battery capacity: 1000 mAh