Our TREVA 10 Inch Portable Smart Power® Fan with AC adapter & USB charging port is the perfect home accessory. Always be prepared! This Smart Power® Fan automatically selects the lowest cost power option. This fan has three power sources: plug in with AC or DC adapters (included), 8 D-Cell batteries (not included) or use built-in rechargeable batteries. This powerful 2-speed fan will always keep you cool. It also has a USB Power Port for charging your cell phone or other mobile devices. Stable base with stabilizing feet. Tilts for directional air flow. Compact design makes it great for travel; easy to carry and store. Perfect for camping and outdoor activities. Ideal for power outages. Battery life: up to 56 hours on low and 37 hours on high.