My laptop has been running kind of hot lately so I decided to get a USB powered cooling fan but I have never purchased one before so I wouldn't know where to start or what brand to get. I have a 15.4'' inch laptop and I actually want to be able to use it on my lap so if at all possible I would like a fan that can connect to the laptop so it doesn't fall off. I don't even know if fans are made like that, though, because as I said I have never purchased one. Thanks in advance