The CTWU-61B supports a maximum resolution of 2560 x 1600 (WQXGA). That's over thirteen times the resolution of a 640 x 480 (VGA) multimedia projector, which is the most frequently found resolution supported by projectors of a comparable type and age to the CTWU-61B. 640 x 480 (VGA) is also supported by this projector.
A 2560 x 1600 (WQXGA) supported graphics resolutions is in fact the best supported resolution across all data projectors that were released one year ago.
A 640 x 480 (VGA) supported graphics resolutions is the worst supported resolution across comparable types of projector.