Canon Canoscan LIDE 20 Desktop flatbed scanner. Powered directly from the USB port. This is what Canon say: The CanoScan LiDE 20 is the ideal scanner for starters. It's easy to install
Canon Canoscan Lide 25 Photo And Document Scanner 1200 X 2400 DPI Tested Works | eBay
CanoScan LiDE 25 Setup CD-ROM - Macintosh Repository