COLD HEAT SUCKS! Trust me on that. I purchased one last week, took it out of the package, got one solder point out of it and then the second point ended up melting the internals of the device before it managed to get the point hot enough to melt the solder. Its next trip was to the trash can.
It doesn't actually heat up the tip, instead, the device works by creating a "short" across the "split" tip when it is in contact with a conductive surface. The 4 AA batteries are then supposed to cause an intense enough short to heat the conductive surface to a temperature suitable for melting solder. IT DOES NOT WORK, total waste of money.
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