This laptop cooler is a beautiful product. I have two sets of knobs that turn on the five fans with light on them the first knob turn on the first set at the bottom while the other knob turns on the last three at the top. There is a USB cable that comes attached beneath the cooler which is used to power the cooler pad. It wrapped neatly and is long enough to span most large laptops. There is also a bump stop, that prevents the laptop from falling off when you raise the height of the cooler pad based upon your preference of height adjusted. ALL IN A GREAT PRODUCT!!