Our brand new Smart Power® technology automatically chooses the least expensive and most efficient power source possible to operate your fan. The built-in rechargeable batteries can charge up to 500 times, which is equivalent to using over 150 alkaline batteries. With Smart Power®, you'll have *up to 75 hours of cooling no matter where you choose to go.
* Final battery life depends on product and the age and quality of batteries used. Battery life is determined using low speed.