O2Cool 10 inch Portable Smart Power Fan withAC Adapter & USB Charging Port - The Smart Power technology automatically selects the lowest cost power option. This fan can be powered by plug-in or by 8 D-Cell batteries (not included), or use built-in rechargable batteries. There is also a USB Power Port for charging your cell phone or other mobile devices. Powerful 2 speed 10-inch bladeConvenient flip-up handleStable base with stabilizing feetTilts for directional air flowCompact design makes it great for travel; easy to carry and storePerfect for camping and outdoor activitiesIdeal for power outagesRechargeable batteries: Included12V/1Amp AC Adapter: Included12V Adapter: IncludedRechargable Battery Life - up to 5 hours