Small fan cools air up to 30F. Runs on 4x 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. * It is Portable and convenient.