Samsung E65. Diagonal: 152.4 mm (6 "), Technology: E Ink, Gray scale levels: 8 levels of grey. Document formats supported: ePub, PDF, Audio formats supported: MP3, Image formats supported: JPG. Internal storage capacity: 0.25 GB, Maximum memory card size: 2 GB. Interface type: USB 2.0. Battery technology: Lithium-Ion (Li-Ion), Battery capacity: 1500 mAh