Thanks to the comment I chose the latter, after several days of testing I just say that my computer has a 17-inch HP default to fan level 2 heats much less therefore taken a usb usb cable used to connect to your computer on off button for USB jack continues to fontionner even sleep (bonnet close) like mine. Wheel more or less reduced to increase the fan, I have not seen any difference still running at the same speed, very light. In conclusion very good camera that I recommend, a little expensive.