The Benq TH682 supports a maximum resolution of 1920 x 1200 (WUXGA). That's over seven times the resolution of a 640 x 480 (VGA) data projector, which is the most common resolution supported by data projectors of this type and age. 640 x 480 (VGA) is also supported by this projector.
A 1920 x 1200 (WUXGA) supported graphics resolutions is in fact the best supported resolution across all projectors of a similar age and type to the TH682.
A 640 x 480 (VGA) supported graphics resolutions is the worst supported resolution across comparable types of projector.