This makes desoldering (specially through hole) 1000000x faster, better and cleaner. This is a time saver! Go get yourself one! With all the difference size nozzle and quick change, you don't need your old manual pump tool.This is the JP domestic version, it supposed to only work with 100v. At 120v the pump does work at 20% higher than spec, but just think of it a turbocharged pump now. The heating element part stays fine, that part is regulated.You can research this on the internet and find way to mod the unit to spec the same as the US version.