Woo&reg; Portable 4 * AAA Batteries USB Powered Bladeless Mini Air Condition Desktop Cooling Fan (Blue) Color: mainly blue. Material: durable hard plastic and soft sponge. The principle is simple and unique, creating two efficacy of normal blowing or cool breeze for choice. (built-in sponge for absorbing cool water and freeze to generate cool breeze.) Keep the air humidity and let you say goodbye to summer heat waves. Powered by the included USB cable or 4 * AAA batteries (not included). Bladeless safe design, free from injury by blades especially to children