USB Hand-Held Cooling Fan produces cold water evaporation cool air flow to keep you cool anytime under the sun or home. USB Hand-Held Air Condition takes evaporation cooling technology a step forward by engineering big cumbersome "swamp coolers" into a lightweight mobile device. Designed to be used on the go. USB Hand-Held Air Condition runs on USB (or batteries, batteries are NOT included) for true portability and versatility. Simple soak the cellulose sponge (included) with water and turn the power on, USB Hand-Held Air Condition will instantly provide you with blasting cool air with hours of relief from the heat.