Two-speed operation 10-inch blades USB Power Port Flip-up handle Adjustable grill Smart Power technology Multiple Power Sources: AC and DC adapters (included), 8 D-Cell batteries (not included) or built-in rechargeable batteries Dimensions: 12.20" x 4.80" x 14.00"   The 10" Smart Power Rechargeable Fan maximizes energy efficiency by automatically choosing most efficient power source available. It is capable of power using built-in rechargeable batteries, 8 D batteries, AC or DC Adapter. It also features a USB port to charge cell phones, tablets, music devices and more. This fan is ideal for indoor or outdoor cooling needs. Take it camping, on trips to the beach or use in home or office. It’s lightweight design and convenient built-in handle make it great for travel and easy to store! The TREVA 10" Smart Power Rechargeable Fan. Convenient portability. Wherever you need it.