MiniMax Deluxe Portable 737 4.5 Battery Operated Fan White. Portable fan that folds flat. 300 hours use from 4 D cell batteries. Powerful but quiet airflow. Energy efficient, compact and powerful. The model 737 MiniMax fan is a favorite for hurricane preparedness because of its powerful airflow and efficient battery use. Ideal for boaters looking for added circulation without having to wire into their 12 volt system. Features Variable speeds. Anti-slip rubber feet. Long life motor. AC adapter ready. Benefits Match air speed to each different use. 300 hours use from 4 D cell batteries. Economical circulation. Sleeping comfort. Powerful but quiet airflow. Battery efficient. Use on or off the boat Portable fan that folds flat. 300 hours use from 4 D cell batteries. Powerful but quiet airflow. En Features . Variable speeds Anti-slip rubber feet. Long life motor AC adapter ready. Benefits Match air speed to each different use 300 hours use from 4 D cell batteries Economical circulation