The function is almost meaningless. All "quiet" USB fans are very similar, if not the same. It was quiet on level 1, but I had a slight ticking noise in the background. Setting 2 and 3 - Fan speed noise washes away that ticking noise. Setting 2-3 was really the only viable setting for close range cooling. So, anything and everything - a small fan is a small fan. Now the function. I liked that this fan could be mounted on a wall or ceiling. As I got this for a van to mount under a closet I thought this feature would be perfect (minimizes the footprint) except all the pics are of it (WHITE FAN with BLACK USB CABLE) no cable! This is a photo of how it will sit on a wall, table or ceiling. Also if it were square with a square seat frame it would look a lot better.
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