Advanced E-Ink screen technology - Open source for your books - Unlock you chose from any where on internet - support ePub - PDF - BBeB Book -  TXT - RTF - Micrsoft Word -  Picture: JPEG - PNG - GIF - BMP -- Easy notes taking - OS: Windows or Mac OS. AC Power: USB Charger - two weeks reading with single charge (7,500pages )- 512M Memory - Expandable to 16GB! (carry 10,000 books) 6.9 x 4.8 x .4 inches