I found my computer was giving me a little bit of trouble so I called a friend of mine to come over and see what was wrong. He came over and informed me that I had an excess amount of dust collected on the fan on my computer and that would cause it to over heat. He brought his duster with him and he told me that this would fix all of my problems. The duster came in a really large bottle and I was surprised with the amount of force that came out of it, and how much air came in the bottle. It was easy to use, and it came with a thin nozzle which allowed it to blow the dust out of the tiniest of holes. After he blew all the air off the my fan, he cleaned out my keyboard and even the gaps on the speakers built into my monitor. The duster was very effective at removing all the dust that had collected on and around my computer and immediately after finished I had no more problems with my computer. He said that one bottle of dust off would last him over a year and by using it every month this would ensure that your computer wouldn't overheat due to excess dust.