The next time lightning strikes, make sure you’re prepared to power up with Treva. Perfect for indoor or outdoor activities, the Treva by O2COOL 10-inch Battery Operated Portable Fan is perfect for a small room, RV or camp, and is great for weather emergencies during warm weather, such as thunderstorms, hurricanes or high winds. It operates on six D-Cell batteries (not included) or can be plugged into an electrical wall outlet for flexibility. The 10-inch Battery Operated Portable Fan also offers high and low speeds, and boasts a patented fan blade design that extends the battery life while maximizing airflow. Cool by Design®, this portable fan features a foldable design with a built-in handle so you can take the cool with you. Powerful 10 inch, 2-speed fan with AC adapter Compact design perfect for travel and storage. Adjustable tilt for directional airflow. Built-in carry handle. Battery Run Time 53 hours low, 20 hours high.