USB Mini Tower Desk Fan Cooling Fan for Computer Notebook Office Outside Travel Compact tower design uses minimal desk space Specially designed blades for superior airflow Powered by USB cable. You can connect USB port on PC, laptop, notebook or host of desktop computer and so on. On/Off switch and 2 level fan speed control knob. NOTE:The fans class product rotation will have some noise, so before buying, please make sure that whether you can accept it. A piece of base plate are provided to keep the fan body more balanced and when you use the fan youd better stick the base plate to the bottom of the fan.