this thing is just a pos. first off the whole "cold" aspect of it is bull****. in the commercial the guy touchest it two seconds after he solders two wires together. I attempted this and burnt the **** out of my self. Metal does not cool down that fast. Secondly, I agree with everyone else who said its to frustrating to use. Its too difficult to use the head that its supplied with, and it has already proved to be so worthless to me that I do not intend on wasting any more money trying to make thos thing work.
I went to radio shack and purchased a regular soldering iron.