The highest resolution supported by the CTWQ-51B is 2560 x 1600 (WQXGA). That's over thirteen times the resolution of a 640 x 480 (VGA) multimedia projector, which is the most common resolution supported by multimedia projectors of this age and type. 640 x 480 (VGA) is also supported by this data projector.
A 2560 x 1600 (WQXGA) supported graphics resolutions is in fact the best supported resolution amongst all 5300:1 contrast ratio projectors that have been available for around the same time as the CTWQ-51B.
Amongst similar types of multimedia projector the worst supported resolution is 640 x 480 (VGA).