Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Useless piece of equipment.

I purchased the USB Vacuum Cleaner/hoover for laptop to clean the dust off of my keyboards. When I received the unit and plugged it in, I could hear it run, but absolutly could not feel any vacuum whatsoever. I pressed the turbo mode and the noise got louder but there was no discernable suction. I held it down to a small piece of fuzz that was lying on my surface area and if I touched the fuzz, it would pick it up and stick it onto the brush. This thing is absolutly useless; it does nothing. It is beyond me how anyone could put something like this on the market; don't they ever try out things before they sell them?Any how, Amazon refunded my money and never got back to me about returning the unit. It is still sitting here on my computer stand waiting for someone to tell me if they want it returned or not.