Ion Audio Omni Scan
CMOS image sensors are slowly replacing CCD sensors, due to reduced power consumption and better image quality. They can be very compact and cost relatively little to produce.
2736 x 3648dpi
The highest resolution the scanner can put out without using software to make it bigger. In dots per inch.
Canon CanoScan LiDE 700F
9600 x 9600dpi
Bit depth means the number of bits per pixel, so the higher the bit depth, the greater number of colors the system can scan.
HP Scanjet G4050
With more USB ports, you are able to connect more devices.
HP Scanjet Enterprise 7000nx
Newer USB versions are faster and have better power management.
Fujitsu ScanSnap iX500 Sheet-Fed
The device has a standard memory slot (such as an SD or micro SD card slot) so that you can either extend the internal storage with affordable memory modules or you can retrieve data, such as photographs, easily from a memory card.
Film scanners can scan film negatives.