No Power, No Problem! O2COOL's fans are perfect for staying cool when your power goes out. This 5" portable Battery, Or USB Powered Fan is perfect for indoor and outdoor activities, use in hot office and especially during a power outage. Dual power sources - plug into your computer with USB or run on 4 "AA" batteries (not included). Powerful fan offers quiet cooling. Compact folding design makes it great for travel & easy to carry & store. Take it anywhere portability. The included USB cable supports your need for extended periods of cooling without changing batteries. O2COOL's patented fan blade design extends battery life while maximizing airflow. Blade size: 5" Assorted colors Portable fan Battery, or USB powered Dual power sources: plug into your computer with Usb or run on 4 "AA", batteries, not included Powerful fan offers quiet cooling The fan folds flat making it easy to carry and store Take it anywhere portability.