The highest resolution supported by the LV-7392 is 1920 x 1200 (WUXGA). That's over seven times the resolution of the most common graphics resolution of 640 x 480 (VGA).
A 1920 x 1200 (WUXGA) graphics resolution is in fact the best supported resolution across all data projectors of this age and spec.
A 640 x 480 (VGA) graphics resolution is the worst supported resolution across similar types of data projector.
If the resolution of this data projector is not high enough for you then you might want to look at the Canon LV-7490 (£636.00) (720 x 480|720 x 576|1280 x 720 (HD 720)|1920 x 1080 (HD 1080)|640 x 480 (VGA)), or the Hitachi CP-DH300 (£470.09) (1280 x 720 (HD 720)|1920 x 1080 (HD 1080)|640 x 480 (VGA)) which also has a higher Rating.