The O2 Cool Battery or Electric Portable Fan lets you have refreshing cool air wherever you go. Take it to the backyard, inside your tent, on a picnic, or use it during a power outage. It runs using the included AC adapter that’s 30 percent more efficient than traditional adapters or 8 “D” batteries (sold separately). Up to 40 hours of battery life. It’s convenient handle and compact design makes it easy to store or carry. 3.7 x 13.1 x 11.9 inches. It operates on two different speeds. Order now and Get 13% off O2COOL 10″ Battery or Electric Portable Fan in Black