From Weller this is the Pyropen Piezo, a refillable gas-powered Profi-Line soldering iron, a unique professional, cordless, versatile piece of soldering equipment. Excellent for use when working in the field as this soldering iron is a lightweight, compact soldering iron and ready to use within 30 seconds. The Piezo Pyropen fills with butane gas and we recommend using only the Weller PGR1 butane gas refill, stock number 2161668. When closed the Pyropen soldering iron looks like a standard pen, the top protects the solder tip when not in use and the base of the pen holds the reservoir of butane gas. You do not need an external ignition source to ignite the soldering iron as it is self-igniting due to the Piezo igniter. Replacement hot air soldering nozzles and solder tips are available and the Pyropen Piezo is a great addition to any soldering kit.