Buying A Scanner

This is the ad for my scanner:

Some Specifications!

Product Specifications

? Product Code :	XP3233
? Product Dimension Information	430 x 280 x 41.8 mm
? Warranty	12 months
? Packaged Weight (kgs)	3.12
? Energy Rated	Yes
? Frequency	50 - 60Hz
? Interface	USB 2.0 Hi-Speed
? Power Consumption	Operation: approx 12W. Sleep: approx 3.5W
? Scan Colour Depth	16 / 16 bit Pixel Depth
? Scan Resolution	4800 dpi x 9600 dpi
? Scan Speed	Approx 14 secs
? Scan Type	Flatbed
? USB Interface	Yes
? Voltage	220 - 240V

TERMS:
DPI:
This means Dots per inch, like for example in this scanner the resolution is 4800DPI times 9600DPI
Optical Resolution:
The physical resolution at which a scanner can capture an image. This may be less than the stated resolution of the scanner, especially in flatbed scanners which commonly employ interpolation to provide the illusion of much higher resolutions.
Colour Depth:
Color depth or bit depth, is a computer graphics term describing the number of bits used to represent the color of a single pixel in a bitmapped image or video frame buffer. This concept is also known as bits per pixel (bpp), particularly when specified along with the number of bits used. For example the colour depth for this scanner is 16/16 bit pixel depth.