Aluratek LIBRE | PRO. Diagonal: 127 mm (5 "). Document formats supported: ePub, FB2, PDF, PRC, RTF, TXT, Audio formats supported: MP3, Image formats supported: JPG, GIF, BMP. Compatible memory cards: SD, Maximum memory card size: 32 GB. Interface type: USB 2.0, USB connector type: mini USB A, Headphone connectivity: 3.5 mm. Battery life (max): 336 h, Continuous reading time: 24 h, Battery technology: Lithium Polymer (LiPo)