Portable Small Fan Mini-air Conditioner, Runs On Batteries Or USB Cable Summer Fan Runs on 4x batteries(not included) or USB power compatible (USB included). Variable speed allows full control over output. The perfect desk fan for the office. Portable Cooler is a mini air-conditioning fan. Simply add water to activate patent-pending cooling feature. 90 Degree rotatable turbine wheel allows you control the direction of the cool blast.