theres a bunch of different ones out there, find one thats goes best with your laptop's vent. for instance, that one wont work with mine because thats blowing air where my laptop blows air out. and the others i've seen so far just simply blows air on the bottom exterior. if its really cheap go for it, i dont see too big of a difference that thing can make and its certainly not worth the 50+dollars as some are priced.