The CTWQ-51B supports a maximum resolution of 2560 x 1600 (WQXGA). That's over thirteen times the resolution of a 640 x 480 (VGA) data projector, which is the most common resolution supported by multimedia projectors of this spec and age. 640 x 480 (VGA) is also supported by this data projector.
This data projector's resolution (2560 x 1600 (WQXGA)) is actually the best supported resolution amongst all projectors that were released one year ago.
The worst supported resolution across similar types of data projector is 640 x 480 (VGA).