High Quality Portable Small Fan & Mini-Air Conditioner Stay Cool Handy Cooler Speed Adjustable Small fan cools air up to 30F. Runs on 4x batteries or USB power (adapter included). Adjustable 90 degree vertical airflow control. Flat bottom surfaces allows easy transformation from a hand This mini fan produces a 15 knots sensational breeze *measured at outlet vent. Simply add water to activate patent-pending cooling feature.