Five stars because it does the same job as products that are 5 and 10 times its price (I bought it for €2.16) without having significant differences that justify the price difference other than the manufacturer's brand printed on the side.
I had a similar branded air blower for my camera and needed a new one because I lost it, this one does exactly the same job!
The only "issue" I found is that the white plastic doesn't fit perfectly into the elastic opening and after every 20-30 "blows" it starts to come out slowly, you just have to put it back in place and everything is fine.
It goes without saying, but it is obvious that it is only suitable for specific uses, e.g. for dust on a camera sensor or charging port of a mobile phone, and not for cleaning dust from keyboards or processor fans.
I would definitely buy it again! I already regret not buying a second one!