LCD's which are not typically used for computers report their resolutions differently. When a CRT says it is 1024x768 it means that it is 1024x768. But when an LCD says that it is 1024x768, it is actually 3072x768 because there are actually three pixels (one red, one green, one blue) for every one in a CRT. For computers these values are usually reported in their equivalent CRT resolutions.
So the advertisement that it is 2400x480 is misleading, but not untrue.
2400x480 LCD = 800x480 CRT