USB drive mouse cum vacuum cleaner

I think this is crazy. It took me an hour to understand the device. Well, let me try explaining it. This is a USB drive connected mouse. At the same time, if only you have a dusty table then it acts as a vacuum cleaner, which needs to be emptied timely. Here, I do not get it, why in the world would someone want a vacuum cleaner in a computer mouse. I guess to swallow all the eatables you throw on the table while working on your computer. Hard to digest, well that is the fact; innovation can sometimes be a waste of efforts.