SPCinternet Touch e-ink eBook Reader 5601F. Diagonal: 152.4 mm (6 "), Technology: E Ink, Gray scale levels: 16 levels of grey. Document formats supported: ePub, FB2, MOBI, PDF, RTF, TXT, Image formats supported: BMP, GIF, JPG, PNG. Internal storage capacity: 4 GB, Compatible memory cards: microSD (TransFlash), microSDHC, Maximum memory card size: 32 GB. Interface type: USB 2.0, USB connector type: micro USB B. Battery life (max): 30 h