Fairly quiet (which is to be expected from a fan). Each of the two legs is 4 3/4 inches long and 1 1/2 inches wide, making the leg longer than the width of most window sills so it won't be left alone on your window sill. It's better suited to a desk or table if you can't mount it to the window. The legs have rubber feet on the bottom and can be easily removed. The dial is odd - OFF is top and bottom center and there are 3 speeds (1,2,3) on each side of the dial, but this fan cannot change direction (the blades only rotate in one direction). So I have no idea why there are two sets of numbers. The leaflet that came with the fan doesn't explain anything except two pages of safety rules. Very strange, but the fan works. I wouldn't say there's a huge difference between fan speeds (1,2,3) but it's a fan and it works for my needs.
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