Handy Cooler The Original Small Fan & Mini-Air Conditioner, Pink The original patented hand held cooling fan as featured in the Technology Review magazine (M.I.T.) in 2010. Small fan cools air up to 30F. *best used in hot and dry environments. Humidifies air and alleviates allergies. Runs on 4x batteries or USB power (adapter included). Cooling fan assembly utilizes a 30db whisper-soft turbine system. Cooling filter life expectancy: 1 year Wash filter with soap and water before first use and occasionally during life of filter.