... ,no extral AC power required. 2.Scanning target: file,book,magzine,bill,photo,picture,documnet, real object,etc. 3.Scanning size: A4 ... 4 CPU, 512 MB RAM or above,512MB or higher memory,CD-ROM; 2.USB 2.0 Connector,Microsoft DirectX 9 ... Bureau,Archives Bureau and so on. 3 million pixels portable book scanner,usb 2.0 interface