The portable Cooler is a mini air-conditioning fan.It delivers continuous evaporated cool air flow to keep you cool anytimeunder the sun or at home.Portable Cooler takes evaporative colling technology a step forward by engineering big cumbersome"swampcooler"s into a lightweight mobile device.Designed to be used on the go,Portable Cooler runs on batteries(or USB)for true potability and versatility.Simply soak the cellulose sponge(included with water and turn the power on.Portable Cooler will instantly provide you with blasting cool airwith hours of relief from the heat.