Unifire&reg; Portable Small Fan & Mini-air Conditioner, Runs on Batteries or USB (blue) Small fan cools air up to 30F. Runs on 4xAA batteries or USB power . Adjustable analog speed control. Our cooling fan utilizes a 30db whisper-soft turbine system. The perfect desk fan for the office or Outdoor Living. 90 degree vertical airflow control. Flat bottom surfaces allows easy transformation from a hand held fan to a desk fan. Blows a cool breeze on you where ever you go. Fan speed adjustable