This is such a handy little tool.  The tool has the ability, with the included attachments, to change from a torch, to a soldering iron, to a hot knife very quickly.  It runs on butane that you can get at any pharmacy or hardware store.  Lighting the flame is simple.  Simply turn on the butane and light it with a lighter.

***BE SURE TO ONLY FILL THE RESERVOIR ONLY HALF FULL***

Check this video to give you a better understanding of the tool: