Patented fan blades allow for efficient operation and optimum air flow. No matter where you are, bring an o2cool fan along to naturally air condition your environment. Our 5-inch portable fan is the perfect size for your desktop, tabletop, or any surface – both indoors and out. Features a powerful, two-speed blade and tilting option to direct the air flow. Runs on USB (cable included) or 4 AA Batteries (Not Included)