I really like these fans so I bought 7 of them. Cheap and works great. I use these fans around the neck in an inflatable dinasur suit. The buttons are very hard to find (especially if you don't see them) so I put fabric tape on the button for the fan, I also marked the direction the air blows, I also found that I had something like that like a ponytail holder works great. so that they don't fall off their necks when they move violently. If you have long hair, it must be tied back. I wish they had a battery gauge to show the charge level.