I was looking for a cheap Notebook Cooler for my 17 "Dell Inspirion laptop. The Cooler Watched hervoragend under the Notbook. It is now also increased somewhat, which I find very convenient. The power supply works via USB. The cooling performance is excellent. In normal use, the cooling of the notebook turns off almost completely. The only drawback: The Cooler is a little louder than my laptop with its 3 fans. Clear recommendation!