IdeaWorks Kool Down Evaporative Cooler - Enjoy Portable Cooling Relief -DC Adaptor Included - Black ULTIMATE FAN: The portable fan provides cooling relief that can cover a 49 sq. ft. area. This quiet fan provides two speed options and adjustable air vents for optimal comfort WATER COOL-OFF: Simply add cold water to the fans 28oz tank, and enjoy up to 10 hours of ultra-cooling action. Use the water level gauge to easily monitor the water level STAY POWERED: The adapter model includes a DC adaptor