>>2020717It's a refillable butane module that replaces the normal insert in a zippo. when you open the lid of the zippo it opens the valve to let out butane and you spark it like a normal lighter. Then you get the same sort of candle flame like a normal zippo. It's pretty neat, but QC can be spotty, like anything cheap from China.
the same company makes a bunch of different types of inserts, including the jet style flame and "pipe lighters" and Zippo makes butane inserts themselves as well.
