Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Useless!

This is very small. When you squeeze it, air doesn't come through the brush. It looks like there aren't any one way valves in this. So you have to squeeze with one finger covering the hole in the middle of the blower to prevent air escaping through it rather than through the brush. (Maybe this is how it was intended to be used but the blower brushes I have used previously had one way valves.) Even when you get the air through the brush, it is a very small amount so quite useless as a blower.