Powerful 5" fan blade offers quiet cooling * Dual Power Sources: Plug in with AC Adapter (Included) or use with 4 D-cell batteries (not included). * Two speed settings - high and low * Up to 40 hours of battery life (Final battery life depends on the age and quality of actual batteries used. Battery life is determined using low speed.) * Dimensions: 8" x 7" x 3" (Height x Width x Depth)