Quasi useless

I bought this compressed air spray to clean my PC and possibly also my DSLR so.
However, the spray is not recommendable because it - as already mentioned by others - not permanently supplies compressed air, but you have to leave it after a few puffs are first before you get printing again. That in itself is pretty bad, because there are better.
In addition, the spray smells pretty bad, also because I had other items in your hand.
But not, however, last the total KO criterion: It occurs icing fluid from and I can not really see how that would prevent. Thus one harms technical equipment more than that to help them, luckily I test always first on a few dust filters of the PC, I do not want to imagine what happens when you order starts on his expensive lenses me.
I am well aware that other sprays "drooling" when you hold it wrong, for example, at an angle on his head or, but this spray is unfortunately completely useless, because I've just kept all the time.